feat(el3-spmc): Initialize nonsecure_ffa_version in all cases am: 71d7b056ba

Original change: https://android-review.googlesource.com/c/trusty/external/trusted-firmware-a/+/3512252

Change-Id: Ie5e60440149aa75a567ec53417ea9bcdf16c8dcf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>