Launch overlay emergency app by feature flag

Add feature flag to launch overlay emergency app instead of Emergency Info
app for teamfood in the future.

Test: Manually
Bug: 118809382
Change-Id: I618f7aafe0c3896adcd072f5b254d03936e83c16
diff --git a/src/com/android/phone/EmergencyActionGroup.java b/src/com/android/phone/EmergencyActionGroup.java
index d72c265..4f9121a 100644
--- a/src/com/android/phone/EmergencyActionGroup.java
+++ b/src/com/android/phone/EmergencyActionGroup.java
@@ -143,7 +143,7 @@
                 ComponentName name = EmergencyAssistanceHelper.getComponentName(info);
 
                 button.setTag(R.id.tag_intent,
-                        new Intent(TelephonyManager.ACTION_EMERGENCY_ASSISTANCE)
+                        new Intent(EmergencyAssistanceHelper.getIntentAction(getContext()))
                                 .setComponent(name));
                 button.setText(info.loadLabel(getContext().getPackageManager()));
                 visible = true;