MS: Adding Support for Emergency APN in Telephony Framework
(base/telephony)

Replacement for https://partner-android-review.googlesource.com/#/c/171175/

Change-Id: I16fc37f5c00ed79f2370bc46554fc7a24c52c4cb
Conflicts:
	core/java/android/net/ConnectivityManager.java
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 19fff55..7fe1e82 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -3925,6 +3925,8 @@
                 usedNetworkType = ConnectivityManager.TYPE_MOBILE_IMS;
             } else if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_CBS)) {
                 usedNetworkType = ConnectivityManager.TYPE_MOBILE_CBS;
+            } else if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_EMERGENCY)) {
+                usedNetworkType = ConnectivityManager.TYPE_MOBILE_EMERGENCY;
             } else {
                 Slog.e(TAG, "Can't match any mobile netTracker!");
             }