Add Iccid_prefix field

Test: Treehugger runs providers/telephony/CarrierIdProviderTest.java

Bug: 64131637
Change-Id: Ib90bcfb8e589a1d7becc30fc4d1d1c43e88dbd4f
Merged-In: Ib90bcfb8e589a1d7becc30fc4d1d1c43e88dbd4f
(cherry picked from commit 23d6677fb67d3599658b5ef3b894885fa98a5ded)
2 files changed