Merge "Call notify() on preferred APN change." am: cdf4c641b3 am: 33a7a6099e

Original change: https://android-review.googlesource.com/c/platform/packages/providers/TelephonyProvider/+/1514822

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I3e4c0349aadf992d4b9751ca9447688bd604fb41