[automerger skipped] core: Move FastXmlSerializer to module utils am: 3101a1134c -s ours

am skip reason: Merged-In Ifabc201418c54c2f910ff4b95b5240a58a683001 with SHA-1 589f310893 is already in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2816009

Change-Id: I51d1687c6e55dc40edb8191a8658838592ec07b2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>