Merge "Stub implementation for USB audio HAL." am: 2f97fbcc am: 86b3fa76 am: 63f89d91

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2397735



Change-Id: I7c710a0767282fc1f2398c55c19e13c41fa7b49f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>