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

        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.