Add test cases to cover CarrierConfigManager#getConfig[ForSubId]

CTS test cases for the new CarrierConfigManager APIs that can
retrieve carrier configs as needed.

Bug: 244087782
Test: CarrierConfigManagerTest
Merged-In: I80845e898a5cbff01ec9d3cb3c95f4812744fe80
Change-Id: I80845e898a5cbff01ec9d3cb3c95f4812744fe80
(cherry picked from commit 185c9ec780d522cbd09dfb77eb3dde3c13ace4ed)
1 file changed