VCN: Replace hidden API getCarrierConfigSubset(Context, int, String)

This is a preparation CL for moving VCN to a mainline module

Bug: 288465472
Test: atest FrameworksVcnTest && atest CtsVcnTestCases
Flag: EXEMPT pure refactoring
Change-Id: I44470a231cdcf4c0a35c54aba5b1967a0bdb2dd7
1 file changed