Update resource overlay configuration when default subscription changes

When default subscription changes, we should update the resource overlay
configuration with the new mcc/mnc.

Fix: 397605393
Test: Basic telephony functionality tests
Test: atest SubscriptionManagerServiceTest
Flag: com.android.internal.telephony.flags.update_resource_configuration
Change-Id: I7e98cb05160a24c4d6abcc7c23ed287a70fbafcb