arm_ffa: Distinguish between uninitialized and failed am: b0c540552b Original change: https://android-review.googlesource.com/c/trusty/lk/trusty/+/3444379 Change-Id: I576492fe22f585424af53851c8928a2e0f34d938 Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>