feat(spmc): enable handling FFA_VERSION ABI

Report the SPMC version to the caller, currently v1.1 and
also store the requested version to allow the SPMC to
use the corresponding FF-A version in future ABI calls.

Signed-off-by: Marc Bonnici <marc.bonnici@arm.com>
Change-Id: I79aafd1e6694cbd4b231bbd0cac5834a71063d79
2 files changed