Replicate Jussi Kivilinna's change for the newly added STM32F2xx and F3xx family members.  This change allows selecting voltage output scale mode and enable over-drive only when needed.

1) The first enables building with CONFIG_ARCH_IDLE_CUSTOM enabled.
2) The second allows changing voltage output scaling setting and prevents enabling over-drive mode for low frequencies (STM32 F74xx, 75xx, 76xx, 77xx)

STM32, STM32 L4, and STM32 M4: USB OTGFS DMA trace output fix
STM32: Add dump buffer feature to stm32 F4 series
STM32 and STM32 L4: Fix bad USB OTGFS register address
STM32 L4:  Fix typo in USB OTGFS register usage
STM32 L4:  Add check in USB OTGFS driver to assure that SYSCFG is enabled
Nucleo-L496ZG:  Make HSE on Nucleo-L496ZG default to enable USB

net/sixlowpan:  The logic that extracts interface identifier from the IP address needs to be generalized to handle cases where the address is not a link local address.

configs/open1788:  Enable discrete joystick input.  This is sufficient to get through all menuing that does not require text input.

net/icmpv6:  icmpv6_input() needs to set d_len to 0 after consuming echo reply, otherwise, garbage will get sent out.

configs/open1788:  Add support for the discrete joystick driver.  Update the pdcurses configuration to use apps/examples/djoystick.

Fix sscanf character conversion (%c): do not add '\0' at the end as for strings, cause, for example, parsing one character will fill two bytes: character itself and zero one '\0' after it, so will overflow one byte variable argument and corrupt memory for variables allocated after it.

    libnx/nxfonts:  Cosmetic; reduce amount of debug output.
    configs/open1788/pdcurses:  Add a configuration for testing pdcurses.

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>