Merge "Make A11yServiceConnection PendingIntent immutable." into rvc-qpr-dev am: c05fbe6b00 am: 58644a9a83

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11745978

Change-Id: Ibe70ca768ec4f8b46a161d1cd0b7877498505b09