Call notify() on preferred APN change.

Test: manually verified failing scenario works correctly now
Bug: 155426801
Merged-in: Ie8b7e651ba1aa3cbd290f909808dd90f01f94c9b
Change-Id: Ie8b7e651ba1aa3cbd290f909808dd90f01f94c9b
(cherry picked from commit 5f3ee015686436812bba7d98f758eff9e5163e74)
1 file changed