Merge "telephony(services): Use FastXmlSerializer module utils" into main am: 332234be82

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/2816888

Change-Id: I7c5ca6d629a9efde08a0a469f35aeb7d3ad1a3e3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>