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Upcoming RD platforms will have an updated memory map for the various
pheripherals on the system. So, for the newer platforms, handle the
memory mapping and other platform specific functionality separately
from the existing platforms.

Change-Id: Iab1355a4c8ea1f6db4f79fcdd6eed907903b6a18
Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>