Merge "Add seat backrest properties to the emulator for CTS tests" into tm-qpr-dev am: 0c1b340132 am: e7087a2d5d

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/19442108

Change-Id: I3d488e2890941bbe96fce2e7f35ad774aa36619d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>