[automerger skipped] audio: Add a helper class to simplify legacy HALs...

[automerger skipped] audio: Add a helper class to simplify legacy HALs migration am: 29fc7492 -s ours am: 6f3185fc -s ours

am skip reason: Merged-In Ie8ae0338fd22f705e00a34e56a7fa235eda5ed9e with SHA-1 43a85cfb is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/24288188



Change-Id: I2cfdb215498d7d63b7b7224e7c51d006f8029ad3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>