Merge "Make WallpaperMS bind wallpaper component PendingIntent immutable." into qt-dev am: e174ab0148 am: 02513e4866 am: 676b35b98e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12719027

Change-Id: I24f3d0bf3e917fc2967348523dfc1017276bc304