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

SAMA5: The PIO used for the red LED is also used as the camera module reset line:  Added a configuration option to suppress use of the red LED if the PIO is used for another purpose.  Reported by David Sidrane.

apps/netutils/ntpclient:  Add a primitive NTP client.  Initial checkin is untested and probably incomplete

Add some checks:  if getpid() or get_errno_ptr() are called very early in the initialization sequence, they would fail

configs/*/defconfig: Increase the number of pre-allocated watchdogs in configurations that use networking or USB

Back out part of  610e2aa0c224e2936fe8009ef4a2351ce607067a: Need to be able to select USB console devices when there is no /dev/console enabled.  Noted by Librae

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