Merge "EARC: Add eARC AIDL files" am: 7fb9baae1c am: 87243fbbd7

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2308889

Change-Id: Icc35b33e34186b3c501ec852a41a5d54a4feaee6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>