audio: Add API to get io handle am: 1d2d51a55d am: 9d5a3d5ad7

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2393093

Change-Id: I7b301c65f0f34bdf9b2d2268dd0119435b434bc3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>