feat(lfa): add LFA SMCs tests using a single CPU

Add a LFA tests for single CPU without the Activate SMC.
Also, include a negative test case where the firmware
is unavailable for activation during the Prime phase,
resulting in a failure.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I9fff281f77de87580f5b3c1fecd69fbf0f5d1f2d
4 files changed