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

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

Change-Id: I6ed5d7d652d73ad01f5213500c5dac71dca8389c