Add unofficial intent for WifiTetherSettings

This CL adds an intent that can be used to start
WifiTether Settings.

Test: SettingsGatewayTest still passes
Bug: 110235497
Bug: 80251951
Change-Id: Iac94e563a91b1f821f69f18234d8176350ae5f29
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index 0ad964b..cd5a908 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -32,6 +32,7 @@
     public static class BluetoothSettingsActivity extends SettingsActivity { /* empty */ }
     public static class SimSettingsActivity extends SettingsActivity { /* empty */ }
     public static class TetherSettingsActivity extends SettingsActivity { /* empty */ }
+    public static class WifiTetherSettingsActivity extends SettingsActivity { /* empty */ }
     public static class VpnSettingsActivity extends SettingsActivity { /* empty */ }
     public static class DateTimeSettingsActivity extends SettingsActivity { /* empty */ }
     public static class PrivateVolumeForgetActivity extends SettingsActivity { /* empty */ }