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 TWI: 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 EMAC/GMAC: If running from SDRAM, BOARD_MCK_FREQUENCY is not a constant and cannot be used in pre-processor conditionals

SAMA5 CAN: If running from SDRAM, BOARD_MCK_FREQUENCY is not a constant and cannot be used in pre-processor conditionals

SAMA5 ADC: If running from SDRAM, BOARD_MCK_FREQUENCY is not a constant and cannot be used in pre-processor conditionals

examples/touchscreen:  Add a configuration option to indicate that there is or is not an architecture-specific initialization function

Add logic for TM4C125GXL clocking based on prototype from from Daniel Carvalho with modifications. I think the LM4F120 may have broken before as well(?).  In any event, the LM4F120 also works well with this chanage

SAMA5 UDPHS: Fix error where bit was not cleared to acknowledge receipt of data and to setup for the next incoming data

SAMA5 clocking:  USB clock setup needs to be done no matter the state of BMS and not matter how we are booting

Kconfig:  Remove warnings.  ARCH_RAMFUNCS depends on ARCH_HAVE_RAMFUNCS, so it is not possible to select ARCH_RAMFUNCS wihtout ARCH_HAVE_RAMFUNCS

SAMA5:  Don't use MMU PMD bufferable bit to try to control write-through vs write-back.  It does not work that way

SAMA5: Update from David Sidrane to last RAM function change:  Apparently inline functions need to placed into the same RAM section, or they do not get inlined.  From David Sidrane

Fix a build error when only USB device tracing is enabled (from David Sidrane).  Also an update to the USB tracing document