Add CTS test for CarrierConfigManager.KEY_ALLOW_HOLD_IN_RTT_CALL_BOOL.

Design Doc: go/rtt-hold-unhold-config-in-android-connectivity-design-doc

Bug: 413765645
Test: atest CarrierConfigManagerTest
Flag: com.android.internal.telephony.flags.enable_rtt_hold_carrier_config
Change-Id: I7a61366b143660a91e093d3c756a83e844ebefd3
1 file changed