Emulator: add mms agent

As required by CTS
Bug: 30415000
BUG: 31810662
BUG: 37718561

Change-Id: I2dbd2ca0c927f26c2243cc943856d0ff3a32933c
(cherry picked from commit 1718376763dfc3c031035945b870854385ed0d15)
diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index fb7c56f..e7923e4 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -30,4 +30,10 @@
     <!-- Set to true to add links to Cell Broadcast app from Settings and MMS app. -->
     <bool name="config_cellBroadcastAppLinks">true</bool>
 
+    <!-- MMS user agent string -->
+    <string name="config_mms_user_agent" translatable="false">GoldfishNexus</string>
+
+    <!-- MMS user agent prolfile url -->
+    <string name="config_mms_user_agent_profile_url" translatable="false">http://gsm.lge.com/html/gsm/Nexus5-M3.xml</string>
+
 </resources>