[automerger skipped] Use FLAG_IMMUTABLE for InstallCarrierAppUtils am: 76decc9e am: fa5672c8 am: 02a62071 -s ours

am skip reason: Change-Id I8ac155bf53e33474e1fcdb2466743a1e05b92399 with SHA-1 f78245a3 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/11493532

Change-Id: I7f0a352534b5e044f10e71020569c71220f1bc20