Merge "telephony(opt): Use FastXmlSerializer module utils" into main am: 9dece05954

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/2816625

Change-Id: Ica7afaf5ac0e675e59ce7a5a978c76e9267c2f77
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>