Added API on PhoneInterfaceManager for updating fplmn

Bug: 78790236
Test: Finished test on blueline
Change-Id: I6f986008d7f868a28d5d9797fe1f4d5b670d3d1a
Merged-In: I6f986008d7f868a28d5d9797fe1f4d5b670d3d1a
(cherry picked from commit 2737e88a7d2b19f072a04dd3913a20f5f15f2817)
1 file changed