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: Insert VZW SIM and dial emergency call, then check if WiFi can be turned off.
Bug: 117912348
Bug: 120583450

Change-Id: Ib2a9c5732fa9f81349ec93e8326d2e5753fed0f7
Merged-In: Ib2a9c5732fa9f81349ec93e8326d2e5753fed0f7
(cherry picked from commit 7f6a473a)