Add serialization tests for libaudioclient am: d980f658 am: 515d7e74 am:...

Add serialization tests for libaudioclient am: d980f658 am: 515d7e74 am: 6acbb229 am: d02fd4be

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2190001



Change-Id: I57f058d9dc0a1fbda2b0c761c7d0dd6ffa1f90b7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>