libril: Remove RIL_REQUEST_DIAL_EMERGENCY

This is not part of the standard API, so remove it.
Samsung devices almost always use the RIL_REQUEST_DIAL_EMERGENCY_CALL
hook, so devices should implement that in their specific RIL subclass.

Change-Id: I2cf9eee00a4b5b02e998d8efcbefa87a9ca7b7b4
diff --git a/ril/libril/ril.cpp b/ril/libril/ril.cpp
index 3e35239..c3f50ba 100644
--- a/ril/libril/ril.cpp
+++ b/ril/libril/ril.cpp
@@ -5166,7 +5166,6 @@
         case RIL_REQUEST_ENTER_NETWORK_DEPERSONALIZATION: return "ENTER_NETWORK_DEPERSONALIZATION";
         case RIL_REQUEST_GET_CURRENT_CALLS: return "GET_CURRENT_CALLS";
         case RIL_REQUEST_DIAL: return "DIAL";
-        case RIL_REQUEST_DIAL_EMERGENCY: return "DIAL";
         case RIL_REQUEST_GET_IMSI: return "GET_IMSI";
         case RIL_REQUEST_HANGUP: return "HANGUP";
         case RIL_REQUEST_HANGUP_WAITING_OR_BACKGROUND: return "HANGUP_WAITING_OR_BACKGROUND";