Bug fix of ModemActivitInfo update am: 917fdc6257

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/20583574

Change-Id: Ice2c4e3f92e0ef3de966bc83b115712e4eeefd1d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>