examples/touchscreen:  Add a configuration option to indicate that there is or is not an architecture-specific initialization function
Remove some warnings introduced with the last change
Costmetic changes to some comments
Updates to the STM32 OTGFS host logic from Leo
Undefine IRQPRIO in all configurations it should not be set
SAMA5 ADC: If running from SDRAM, BOARD_MCK_FREQUENCY is not a constant and cannot be used in pre-processor conditionals
Sourceforge Patch #37:  Missing semicolon
SAMA5 CAN: If running from SDRAM, BOARD_MCK_FREQUENCY is not a constant and cannot be used in pre-processor conditionals
SAMA5 EMAC/GMAC: If running from SDRAM, BOARD_MCK_FREQUENCY is not a constant and cannot be used in pre-processor conditionals
SAMA5 SSC: If running from SDRAM, BOARD_MCK_FREQUENCY is not a constant and cannot be used in pre-processor conditionals
SAMA5 TWI: If running from SDRAM, BOARD_MCK_FREQUENCY is not a constant and cannot be used in pre-processor conditionals
MIO183QT-9A LCD driver updated to support reading from the LCD.  From Toby Duckwork
STM32 F2:  Fix SPI2 MOSI pin mapping.  From dlsitzer
STM32 OTGFS Host:  Additional trace points from Leo
Costmetic: Replace spaces with tabs
Updated README files
Move the un-definitions of __ramfuncs__ from the sam_clockconfig.c to the common up_internal.h header file so that the attribute will be applied the same to function definitions and prototypes.
SAMA5 EMAC:  Missing right parens from last change.  Noted by Luciano Neri
SAMA5 board.h files use type xcpt_t and so must include nuttx/irq.h for type xcpt_t
STM32 OTGFS Host:  Changes from Leo for low-speed devices and interrupt endpoints