[automerger skipped] audio: Add example HAL implementation am: baf57fb136 am: 5b0e2ae0b7 am: 06e69ef109 -s ours

am skip reason: Change-Id Ie3dd62c5db1cdb5534df4dd7f326c4c8776bf3c4 with SHA-1 c9e1607de4 is in history

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1507219

Change-Id: Ibfe16922c32416b5075cbc1b67b5a731b1228a4a