Add RD-1 AE platform documentation

Add a documentation page for RD-1 AE which includes a basic
overview of the platform, the secure services used and a link
to the official documentation.

Change-Id: I08e5dd07de2aeea4222994011a3f2daf03a04cf4
Signed-off-by: Ziad Elhanafy <ziad.elhanafy@arm.com>
2 files changed