Revert "libaudiohal@aidl: Work around use of unsupported mix por..." am: 6b76711f am: c23a263a

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2871088



Change-Id: Ia2b3f3820643974c7bbcaced01455f35d370c001
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>