Merge "Make WallpaperMS bind wallpaper component PendingIntent immutable." into qt-qpr1-dev am: 985f7b1d53 am: 815ca2d7d8 am: 67c0cd04bf am: a9e50438aa

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12715923

Change-Id: I710f724461bea66819eb71dd257b67fa40bd7df4