feat(rmm): add support for multiple rec and cpu

Changes to support creating and
executing  multiple rec on multiple cpus.
Added per REC shared buffer between Host and Rec.

Signed-off-by: Shruti Gupta <shruti.gupta@arm.com>
Change-Id: Ib6dbd814ee9f68df4a53f9cfdc8b7f9c905c35fe
16 files changed