test(spm): add three SME related tests

SME enter SPMC with SSVE enabled.
SME enter SPMC with ZA enabled.
SME enter SPMC with SSVE+ZA enabled.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I092c7618e8de22125b3e957ed557e8177acc2b1f
2 files changed