lib: arm_ffa: Add support for sending FFA_MSG_SEND_DIRECT_RESP2 messages am: 44dd4e8787 Original change: https://android-review.googlesource.com/c/trusty/lk/trusty/+/3378331 Change-Id: I7762e55375acf748266916945060c87023e1e4de Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>