Create NetworkProviderSettings for provider model

Provider model is a feature which improves networks
Settings UX.

NetworkProviderSettings is the fragment which allow
users to choose a mobile network or a Wi-Fi network
to connect.

At this change, NetworkProviderSettings is a clone
of WifiSettings, mobile networks will be integrated
at later CLs.

Bug: 167474581
Test: make RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.network.NetworkProviderSettingsTest
Change-Id: I185639a8f2469e9ec76ad18b6c2bc2e8a4d079e3
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index 2f23c84..026853f 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -82,6 +82,7 @@
     public static class PublicVolumeSettingsActivity extends SettingsActivity { /* empty */ }
     public static class WifiSettingsActivity extends SettingsActivity { /* empty */ }
     public static class WifiSettings2Activity extends SettingsActivity { /* empty */ }
+    public static class NetworkProviderSettingsActivity extends SettingsActivity { /* empty */ }
     public static class WifiP2pSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AvailableVirtualKeyboardActivity extends SettingsActivity { /* empty */ }
     public static class KeyboardLayoutPickerActivity extends SettingsActivity { /* empty */ }