fix(spm): FFA_VERSION to return error

SPM is expected to return error when the version provided by the caller
is not compliant with that of the SPMC.
Before the assumption was that the SPMC would always return its own
version.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I590c858bf73c059772193d994becbb8f7a2b170e
1 file changed