This patch adds ArmFfaConsoleDebugLib. A debug library that utilizes
FF-A Console Log API to print debug messages to the console.
This is useful in context of running the StandaloneMm payload
as a S-EL0 SP on top of SPMC where StandaloneMm isn't allowed to
access console device or no console device (e.x) Hafnium.
NOTE:
FFA_CONSOLE_LOG* could be used by secure partition only.
Signed-off-by: Mohamed Gamal Morsy <mohamed.morsy@arm.com>
