Make STOP_APP_SWITCHES signatureOrSystem.

The NFC service relies on this permission
for it's dispatching mechanism and it is
no longer signed with the platform cert.

Bug: 4173610
Change-Id: I598ad2889c4af307f04433093923255fe7daedbb
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index c8295d7..c6ddb56 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1022,7 +1022,7 @@
     <permission android:name="android.permission.STOP_APP_SWITCHES"
         android:label="@string/permlab_stopAppSwitches"
         android:description="@string/permdesc_stopAppSwitches"
-        android:protectionLevel="signature" />
+        android:protectionLevel="signatureOrSystem" />
 
     <!-- Allows an application to retrieve the current state of keys and
          switches.  This is only for use by the system.-->