Add AudioAttributes and AudioFlag for use in HAL interface for engine configuration. am: dd2b7eb564

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/19874524

Change-Id: I6b850af8186bd9b02bddd0a86ba35d5e7657abe6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>