Merge "Add FLAG_IMMUTABLE to PendingIntents" am: 78f856db7f am: 8f4518cbc6 am: 728100c859 am: aa439b05e7

Original change: https://android-review.googlesource.com/c/platform/packages/apps/BasicSmsReceiver/+/2229419

Change-Id: I54cd2aa0bb8b4bf4e9b98ed674bb27ccea973d34
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>