Prevent data usage dialog from being displayed again

The data usage dialog is displayed every time rotating the device.
To solve this issue, prevent NetworkOverLimitActivity from being
re-created when rotating the device.

Bug: 36801016
Test: manual - show NetworkOverLimitActivity and rotate the device

Change-Id: I51429aa49157756107e9b3fa9d450f82f894dcab
diff --git a/packages/SystemUI/AndroidManifest.xml b/packages/SystemUI/AndroidManifest.xml
index 3ee844c..8005ea7 100644
--- a/packages/SystemUI/AndroidManifest.xml
+++ b/packages/SystemUI/AndroidManifest.xml
@@ -358,6 +358,7 @@
             android:finishOnCloseSystemDialogs="true"
             android:launchMode="singleTop"
             android:taskAffinity="com.android.systemui.net"
+            android:configChanges="screenSize|smallestScreenSize|screenLayout|orientation"
             android:excludeFromRecents="true" />
 
         <!-- started from MediaProjectionManager -->