interface: arm_ffa: Update to version 1.1 am: dabd279c9f

Original change: https://android-review.googlesource.com/c/trusty/lib/+/3381020

Change-Id: I62ed99fce3746c0547570bd0ef02d8df34a2c63d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>