[automerger skipped] Merge "Added FLAG_IMMUTABLE flag for security purposes"...

[automerger skipped] Merge "Added FLAG_IMMUTABLE flag for security purposes" into oc-dev am: 7a90d83f am: 896503f5 am: 9e733ed1 am: ecaa7e3a am: 40deb46f am: d1f9a1c6 -s ours am: c428a13f -s ours am: 1102ee0e -s ours

am skip reason: Change-Id Ice6e438eb437d377f8c5f26891938302fcb0c8d4 with SHA-1 21e03356 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/11432360

Change-Id: I9a7bb43758f36bdcb1e71627bdc5fb2f9cbafb81