[automerger skipped] Merge "Add PendingIntent.FLAG_IMMUTABLE into InstallCarrierAppUtil" am: 18c34c94 am: a539d5cc am: 0aaaf7a3 -s ours

am skip reason: Change-Id I3acceefb261eaea36d6eb357953ffdc4b01f9d8a with SHA-1 1c19f644 is in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/1610814

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I05e7e509692b6f46b66b4acee2a86c058aae4ba4