drivers/lcd:  Add an IOcTL to FT80x driver to write to FIFO CMD RAM.

Added ECANCELED condition to DEBUGASSERT-s checking sem_wait result

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

Fixed misprint in ipv4_forward.c

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

Author: Juha Niskanen <juha.niskanen@haltian.com>
Date:   Mon Feb 19 15:03:17 2018 -0600

    drivers/mtd:  mtd_config.c:  Add still more error handling (to detect bad underlying flash implementations)
    drivers/mtd:  mtd_config.c:  Remove MTD_ERASE that was erasing data block instead of erase block.  This is a partial revert of 4f18b4.  Reported-by: Pascal Speck <iktek01@yahoo.com>
    arch/arm/src/stm32l4:  stm32l4_flash: change flash programming to use page buffer for unaligned writes.

configs/stm32f746g-disco: Add stm32f746g-disco Ethernet configuration. Add USART1 support (connected to the USB virtual serial port)

    drivers/lcd and include/nuttx/lcd:  Add FT80x support for writing to graphics memory.  Also add some definitions needed by apps/examples/ft80x for bitmap manipulation.
    drivers/lcd:  Review/update FT80x initializatin logic

drivers/lcd: Detect and handle more errors in return values within the LCD framebuffer and SSD1306 drivers

include/nuttx/lcd:  Add some FT80x definitions and modify some structures in order to support apps/examples/ft80x.

drivers/lcd:  In order to actually use the new register access IOCTL calls, need to move the register address definitions out of the private header file and into the public header file.

    drivers/lcd:  Rename ft80x_base.c to just ft80x.c.  Add logic to notify FT80X clients of events via signals.
    drivers/lcd:  Trivial updates to naming.  Add some new definitions.

arch/arm/src/stm32/stm32f33xxx_rcc.c:  A flash wait state configuration.  Flash latency must be fixed according to sysclk frequency. If this operation
is not done or done after PLL configuration, the STM32 fail to continue boot
operation if the frequency if greater than 24MHz.  This common t add this operation according to the board variable STM32_SYSCLK_FREQUENCY.  Tested on stm32f334-disco board.

This commit adds a barbones FTDI FT80x driver.  It is untested (I don't even have hardware yet and, hence, it is marked as EXPERIMENTAL

Squashed commit of the following:

    drivers/lcd:  Finishes off basic FT80X.  Still missing some niceties.
    drivers/lcd: Rethink FT80X display list interface.
    drivers/lcd:  More FT800x display list logic.  Still not complete.
    drivers/lcd:  Add some basic FT80x initialization logic.
    drivers/lcd:  Add ft80x display list IOCTL framework.  Still missing low level display list operations.
    drivers/lcd:  FT80x driver cannot be a standard LCD driver but must, instead, be a custom character driver.
    drivers/lcd:  Add FT800 co-processor commands and display list helpers.
    drivers/lcd:  Add SPI interface and framework for the initialization and the basic LCD driver.
    drivers/lcd:  Add beginnings of some FT80x implementation.
    drivers/lcd:  Add definitions for the FTDI FT801 part
    include/nuttx/lcd/ft800.h:  Add initial FT800 interface definition.
    drivers/lcd:  Add ft800 header file.

include/lcd:  Eliminate a warning from an SSD1306 header file by adding a forward reference to struct i2c_master_s.

lc823450 smp test

* sched/clock: Replace critical section APIs with spin lock APIs in clock_gettime.c

    This change will improve performance for SMP systems but nothing
    changes for non-SMP systems. (Pls see include/nuttx/irq.h)

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

* sched/sched: Remove unnecessary DEBUGASSERT in sched_removereadytorun.c

    In SMP mode, rtrtcb is not always at the g_readytorun.head.
    This change removes DEBUGASSERT() to avoid this condition.

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

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

LIS3DH: Fix missing shift when writing output data rate to register

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

stm32f103-minimum/src/:  Fix newly introduced errors and warnings.  Most cause by removing illegal inclusions from board.h.