Ensure ACTION_EMERGENCY_CALL_STATE_CHANGED doesn't send on GSM.

If on a CDMA carrier which supports ECM and roaming on GSM, we should not
be sending the ACTION_EMERGENCY_CALL_STATE_CHANGED intents since we will
not be going into ECM.

Test: Manual
Bug: 117912348
Change-Id: Iac607d1b28d273b77365e2b752f8393af3cc7f16