[automerger skipped] Merge "Use PendingIntent.FLAG_IMMUTABLE in PendingIntent in NotificationMgr" into qt-qpr1-dev am: 8bb4d976f7 -s ours am: e4a7758cf8 -s ours am: 74775df348

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/11345541

Change-Id: I7e3a165adf7043645d7298875b428d22fa451f18