Add MASTER_CLEAR perm to SystemUI for SD card formatting.

Bug: 6422105
Change-Id: Ic6e2aef5f6cdc14c2bace54ddfce1181bf8bdef3

Author: dsandler

packages/SystemUI/AndroidManifest.xml

@@ -29,6 +29,7 @@
     <uses-permission android:name="android.permission.DEVICE_POWER" />
     <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
     <uses-permission android:name="android.permission.UPDATE_DEVICE_STATS" />
+    <uses-permission android:name="android.permission.MASTER_CLEAR" />
 
     <!-- ActivityManager -->
     <uses-permission android:name="android.permission.GET_TASKS" />