Add tests to libaudioclient pre- and post-submit am: f2f012b7 am: 8ba3906b am: 9f03ab21

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2190007



Change-Id: Ida02e4b7e14cbd297f8245c3d2300609053a3a91
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>