Add flag for AP domain selection

Add hangup_emergency_call_for_cross_sim_redialing flag.
This flag controls the behavior of terminating a call for cross SIM
redialing.

Flag: com.android.internal.telephony.flags.hangup_emergency_call_for_cross_sim_redialing
Bug: 331127224
Bug: 336398541
Test: build
Test: Manual testing was conducted to verify if ongoing call is hung up and cross-SIM redialing is performed
Change-Id: Ic73119735d621f5d32d815a6d795f8791ec656c8