[automerger skipped] Merge "Use PendingIntent.FLAG_IMMUTABLE in PendingIntent in NotificationMgr" into qt-dev am: 59d0840be9 am: 3c71659983 -s ours am: 790d883172 -s ours am: 6c15d8fe01

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/11256276

Change-Id: Ic2a748787689cf8bc3dd75667d1b3e964f305e17