test(rmm): add testcase for multiple rec on multiple cpu

Test creates and enter 8 recs on different CPUs.
Exercises CPU_ON, CPU_OFF and PSCI_AFFINITY_INFO
from realm.

Signed-off-by: Shruti Gupta <shruti.gupta@arm.com>
Change-Id: Iecc58ea79bfde28f307d1df99680d707e57a1d80
7 files changed