Fix issue #10971287: Make ACCESS_BATTERY_STATS permission system or signature.

Change-Id: I432a2ddbd2fe1d095bb3895c5c122acf465d0c9b
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index b41b5b5..5a74237 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -2243,7 +2243,7 @@
         android:permissionGroup="android.permission-group.SYSTEM_TOOLS"
         android:label="@string/permlab_batteryStats"
         android:description="@string/permdesc_batteryStats"
-        android:protectionLevel="dangerous" />
+        android:protectionLevel="signature|system" />
 
     <!-- Allows an application to control the backup and restore process.
     <p>Not for use by third-party applications.