Use the new isNetworkSupported api for wifi-only

Didn't have an API for this before so people used a hacked system property (ro.carrier)
to determine if the device supported mobile data.  Added new API and switching callsites.

bug:5087537
Change-Id: Ibd799559be102a9e2fd552d1a23d1afbcf8f4614

src/com/android/settings/DeviceInfoSettings.java

@@ -87,7 +87,7 @@ public class DeviceInfoSettings extends SettingsPreferenceFragment {
                 PROPERTY_URL_SAFETYLEGAL);
 
         // Remove Baseband version if wifi-only device
-        if (Utils.isWifiOnly()) {
+        if (Utils.isWifiOnly(getActivity())) {
             getPreferenceScreen().removePreference(findPreference(KEY_BASEBAND_VERSION));
         }