Dark Theme QS tile

Creates Dark Theme tile and adds it to the default config,
under the fold.

Test: manually toggle tile
Fixes: 130253100
Change-Id: I2859d2eb20db1c6d9dd8e8e24979294316b905bb
diff --git a/data/etc/com.android.systemui.xml b/data/etc/com.android.systemui.xml
index 3562a8f..a4337cc8 100644
--- a/data/etc/com.android.systemui.xml
+++ b/data/etc/com.android.systemui.xml
@@ -35,6 +35,7 @@
         <permission name="android.permission.MANAGE_USERS"/>
         <permission name="android.permission.MASTER_CLEAR"/>
         <permission name="android.permission.MEDIA_CONTENT_CONTROL"/>
+        <permission name="android.permission.MODIFY_DAY_NIGHT_MODE"/>
         <permission name="android.permission.MODIFY_PHONE_STATE"/>
         <permission name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
         <permission name="android.permission.OVERRIDE_WIFI_CONFIG"/>