Changes to allow the font subsystem to be built without enabling the entire graphics system (CONFIG_NX).  Adds CONFIG_NXFONTS and CONFIG_NXGLIB.  NX and NXFONTS are still pretty heavily entangled

Squashed commit of the following:

    libnx: Need to duplicate some Kconfig setting for NXFONTs if it can be configured and built independently of NX.  Also includes some build-related fixes.

    configs/sim:  Disable NX graphics support in the fb configuration.

    libnx:  Basic configuration and build changes to support building font support independend of the NX server.

STM32F7:  Completes architecture support for the STM32 F72x and F73x families.  Adds support for the Nucleo-144 boards with STM32F722.

configs/stm3220g-eval/ide:  Remove the uVision IDE setup.  This has not been used for years and it a maintenance problem for me.

configs/stm32f429i-disco/ide:  Remove the uVision IDE setup that goes along with the ltdc configuration that was removed on 2017-10-28.

STM32F429i-Disco: Convert NxWM configuration to use LTDC framebuffer driver instead of SPI serial.  Also reduce number of layers from 4 to 1 in fb configuration.  Only one layer is used.

Build system:  Fix CONFIG_BUILD_KERNEL logic directories that have ubin and kbin subdirectories.  Conditional logic was fine for CONFIG_BUILD_FLAT and CONFIG_BUILD_PROTECTED but generated useless dependencies if CONFIG_BUILD_KERNEL.

arch/arm/src/lpc43: UART_RX pins should be configured with input buffers enabled. Otherwise it cannot be read.

Build system:  Fix CONFIG_BUILD_KERNEL logic directories that have ubin and kbin subdirectories.  Conditional logic was fine for CONFIG_BUILD_FLAT and CONFIG_BUILD_PROTECTED but generated useless dependencies if CONFIG_BUILD_KERNEL.

configs/lc823450-xgevk: Fix compilation errors on Cygwin

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Remove CONFIG_GRAN_SINGLE.  It adds no technical benefit (other than some minor reduction in the number of interface arguments) but adds a lot of code complexity.  Better without it.

configs/stm32f429-disco/fb:  Enable support for the STMPE811 touchscreen controller and also for the apps/exmaples/touchscreen test.

configs/stm32f429i-disco:  Add logic to auto-mount procfs.  Enable procfs in all configurations that use NSH.

configs/stm32f429i-disco/fb:  Refactor initialization logic so that it is a little more like other boards.  Remove double initialization of framebuffer or LCD drivers (whichever is enabled).

configs/stm32f429i-disco/fb:  Fix a compile issue.  Disable all NX features in the fb configuration.  NX is not needed.

fs/procfs:  Optimization of previous commits.  /proc/umm and proc/progmem are deleted.  /proc/kmm is renamed /proc/meminfo and contains the output that was in all three files previously.

SAMA5/SAMv7:  It is necessary to disable pre-emption and interrupts around a loop that copies TX data into the hardware in order to avoid a TX data underrun condition.

Nucleo-F746ZG: Use the serial console over /dev/ttyACM0 by default.  The Nucleo-F746ZG doesn't come with Arduio RS-232 shield, then it is better to use the serial over the /dev/ttyACM0 that is created automatically when the board is plugged in the computer.

fs/procfs/fs_procfsprogrem:  Add /proc/progmem.  This is an alternative way to get the information that was previoulsy available in apps/system/free.  apps/system/free was removed beause it made illegal calls into the OS violating the portable interface.  This new procfs entry provides the same information with no such violation.

configs/:  apps/system/free has been deleted because it violates the portable POSIX OS interface.  Remove CONFIG_SYSTEM_FREE=y from all defconfig files.

RNDIS support on STM32F4Discovery

* stm32f4discovery: Add stm32_netinit.c to avoid a compilation error

* stm32f4discovery: Add rndis initialization in stm32_bringup.c

    NOTE: MAC address for the host side starts 0xaa.  This assignment
    scheme should be fixed later.

* stm32f4discovery: Add rndis configuration

    NOTE: STM32F4Discovery + DM-STF4BB

* drivers/usbdev/rndis.c: Fix some issues in rndis.c

    Introduce rndis_transmit() and change rndis_rxdispatch() to avoid
    packet corruption. Introduce max packet size for dual speed which
    is mainly used for high speed mode. Fix adjusting MTU warning
    on Linux host. Fix data corruption if a packet size excceds MTU.

    NOTE: Max packet size is not configured dynamically. This should
    be fixed in the future version.

* stm32f4discovery: Modify #ifdef condition for rndis in stm32_bringup()

* drivers/usbdev/rndis.c: Change HPWORK to ETHWORK

* drivers/usbdev/rndis.c: Merge the commit 07b98ccb

    Previous commit b09365784a was based on old rndis.c thus resulted
    in reverting the commit 07b98ccb. This change merges the commit.

    NOTE: In the commit 07b98ccb

, max packet size of bulkout was
    assumed to be 64. In this commit, priv->epbulkout->maxpacket is
    used instead.

Approved-by: Gregory Nutt <gnutt@nuttx.org>

configs/stm32l476-mdk:  Repartition bring-up logic so that it is more like other board directories.  Add support for USERLED driver.  Add bring-up initialization logic for the USERLED driver.