fix(rme): remove RIPAS_UNDEFINED definition

This patch removes RIPAS_UNDEFINED definition
and matches RMM-TF patch
https://review.trustedfirmware.org/c/TF-RMM/tf-rmm/+/21987

Signed-off-by: AlexeiFedorov <Alexei.Fedorov@arm.com>
Change-Id: I26d6c5e6f7c1053d1b2a7688118e6175985be029
2 files changed