Specify FLAG_IMMUTABLE when creating PendingIntent am: 6f7d23a503 am: 4aa8e9a668 am: 0800a8ab8e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Car/SystemUpdater/+/15113943

Change-Id: I32fce92d1d850ef3057dca622c533c4c732d5808
tree: eb245a3f4bd1ee407d13573318e21184366c3f71
  1. res/
  2. src/
  3. Android.bp
  4. AndroidManifest.xml
  5. OWNERS
  6. PREUPLOAD.cfg