lib: sm: Add support handling for FFA_MSG_SEND_DIRECT_REQ2 requests am: 5113ef7718

Original change: https://android-review.googlesource.com/c/trusty/lk/trusty/+/3377901

Change-Id: I6cf30863dd23329de315a83580cfe36ccc958af9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>