Create carrier configs for MCC/MNC-specific roaming notification

Test: atest CarrierConfigTeset, NotificationMgrTest, PhoneGlobalsTest
Bug: 303298150
Change-Id: I1ffe39fd35649d773c38573953e271733802ed91
Merged-In: I1ffe39fd35649d773c38573953e271733802ed91
(cherry picked from commit 54a831e446b27bcec287bc536b9a21cad4d53852)
1 file changed