fix(rme): RMM is not taking PSTATE into account on PN entry/exit

Plane 0 is notified, through RsiPlaneExit.pstate field of RMM PSTATE
upon plane N exit. Also, plane 0 needs to provide RMM PSTATE value upon
calling RsiPlaneEnter through RsiPlaneEnter.pstate value.

This patch implements that behavior on the existing tests for planes
as it was not implemented before.

Signed-off-by: Javier Almansa Sobrino <javier.almansasobrino@arm.com>
Change-Id: I45af6c5863af2d2b7cc92005e16b80b895639f07
4 files changed