Just README.txt and comments affected, no changes in the code

sched/sched:  Fix some priority inheritance related issues noted during review of logic.  Also add some REVISIT comments for some issues noted in the design.

sched/sched/sched_sporadic.c: fix compiler error when priority inheritance is enabled.  Noted by eunb.song@samsung.com

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

drivers/input/ft5x06.c:  Remove cool logic to disable polling when there there is no client waiting for read data.  That was a great idea to save CPU cycles when there is nothing reading from the touchscrren but, unfortunately, does not work with readers that open the driver in non-blocking mode.  So I think we just have to eat the CPUs even when there is nothing waiting for touchscreen input.

configst/stm3240g-eval:  Remove only bogus logic to start the NX server.  That was there only to support the knxwm configuration and was implemented priorit to boardctl(BOARCIOC_NX_START).

Update comments on SMP in README.txt
Enable SYSTEM_TIME64 in defconfigs.
Enable INSTRUMENTATION in rndis configuration.

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

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

Previous commit assumed that the caller is running on CPU0.
However, the caller sometimes runs at CPU1.  This patch will
assign the caller to CPU0 explicitly.

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

configs:  Both CONFIG_LIB_BOARDCTL=y and CONFIG_BOARD_INITIALIZE=y is not meaningful in the standalone NxWM.  CONFIG_LIB_BOARDCTL=y is the better option so  CONFIG_BOARD_INITIALIZE=y removed from these configurations.

configs:  There should be either CONFIG_LIB_BOARDCTL=y or CONFIG_BOARD_INITIALIZE=y in the defconfig of every standalone NxWM configuration to assure that all of the board resources are initialized... especially the touchscreen since it it now a part of the board driver initialization.

Fixed misprint in smartfs_utils.c

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

configs:  Since the touch screen initialization is now called from one-time board-initialization logic, it no longer needs protection from re-entry.

Squashed commit of the following:

    configs:  Each board now initializes the touchscreen controller as a normal part of its board bring-up.  board_tsc_setup() is gone; the touchscreen controller is now treated like any other on-board device.
    Remove all support for BOARDIOC_TSCTEST_SETUP
    Move prototype for board_tsc_setup() from include/nuttx/board.h to individual board header files.

SMP: Introduce spin_lock_wo_note() and spin_unlock_wo_note()

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

These APIs are used in sched_note.c to protect instumentation data.
The deffrence between these APIs to exsiting spin_lock() and spin_unlock()
is that they do not perform insturumentation to avoid recursive call
when SCHED_INSTRUMENTATION_SPINLOCKS=y.

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

Remove the BOARDIOC_TSCTEST_TEARNDOWN boardctl() command.  Remove all implementations of board_tsc_teardown() (the were all stubs anyway except for the simulation).

Fixed nucleo-l432kc broken build when CONFIG_USERLED_LOWER defined

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

Fixes two bugs in multi-block SD-card operations on the STM32F7 platform.  arch/arm/src/stm32f7: DBLOCKSIZE must be the size of SD-card block, not the total amount of transferred bytes.   drivers/mmcsd: respect SDIO_CAPS_DMABEFOREWRITE on CMD25.

configs/lpcxpresso-lpc54628:  Add pin definitions for USART, I2C, and SPI on the Arduino Uno connector.

sched/clock/clock_systimer.c:  Change the way that the 64-bit time is sampled.  Previously, we disabled interrupts before sampling the 64-bit timer since the uint64_t access is not atomic on most CPUs.  However, disabling (local) interrupts does not work in the SMP case.  In that case, the timer interrupt will be running on only one of the CPUs; disabling interrupts on a different CPU will provide no protection from timer rollover.  To work around this, logic was added that samples 64-bit timer is sampled twice and if 32-bit rollover was detected between samples, then loops until there is no rollover.