feat(spm): add VM_ID macro to spm tests

Add helper macro to define an FF-A ID for a NWd VM. Replaced all found
instances in spm related tests.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I9605898a9cc8ebc90c783e590907ab1ec684c4f7
3 files changed