Add AudioAttributes and AudioFlag for use in HAL interface for engine configuration. am: 4cd38845

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2203458



Change-Id: Ib0b019bcb015ea0cb6cb151bae1b11507ce7a281
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>