service_manager: Add trusty service manager am: 7baa447b9c

Original change: https://android-review.googlesource.com/c/trusty/lib/+/3487873

Change-Id: I02d215936846b3c2fbf2fdcf7bc6839b8f203ab6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>