[automerger skipped] audio: Add DriverInterface::start method am: 19d08c00 -s ours

am skip reason: Merged-In I3615a7ca99cb4f1e149dcbfbc912f2ed58fb033f with SHA-1 49712b56 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/23884369



Change-Id: I2b18b86834a8e9ccfcadcbb4692f9067968fa8cf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>