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

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

Change-Id: I4b0344be312729c717afcbdf41acdfa50d8066cd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>