Merge "libaudiohal: Remove unused 'using' directive" into udc-dev am: 10207c29

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/21947202



Change-Id: Ibbc2d26db0569d57d9b41c932a29d1e33bbcf2d4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>