docs(rme): add build and run instructions for FEAT_RME

This patch adds instructions on how to build and run TF-A
with FEAT_RME enabled. The patch also adds code owners for
FEAT_RME.

Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
Change-Id: Id16dc52cb76b1ea56ac5c3fc38cb0794a62ac2a1
3 files changed