Fix ConcurrentModificationException of getEmergencyNumberList

Test: atest; treehugger
Bug: 171542607
Change-Id: I5812469dfb96f30b5b185fc1bb983e3357bb4efa
Merged-In: I5812469dfb96f30b5b185fc1bb983e3357bb4efa
(cherry picked from commit f4ded970a7437c4c2c064cc7dded94da61b8a8a5)
1 file changed