gta4xlwifi: overlay: mark as WiFi-only

Change-Id: I6c3d5118527903fd0b8a6eb5679dede961e01e9f
diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index b1bd1a6..5a0a2d2 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -42,6 +42,12 @@
                cell broadcasting sms, and MMS. -->
     <bool name="config_sms_capable">false</bool>
 
+    <!-- Flag indicating whether the current device allows data.
+         If true, this means that the device supports data connectivity through
+         the telephony network.
+         This can be overridden to false for devices that support voice and/or sms . -->
+    <bool name="config_mobile_data_capable">false</bool>
+
     <!-- This string array should be overridden by the device to present a list of network
          attributes.  This is used by the connectivity manager to decide which networks can coexist
          based on the hardware -->