Allow customisation of advanced settings in DocumentsUI

<?xml version="1.0" encoding="utf-8"?>

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     Licensed under the Apache License, Version 2.0 (the "License");

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<resources>

    <!-- Allow Advanced Devices default value to be customised -->

    <bool name="config_defaultAdvancedDevices">false</bool>

</resources>

    private static final String KEY_FILE_SIZE = "fileSize";

    public static boolean getDisplayAdvancedDevices(Context context) {

        boolean defaultAdvanced = context.getResources()

                .getBoolean(R.bool.config_defaultAdvancedDevices);

        return PreferenceManager.getDefaultSharedPreferences(context)

                .getBoolean(KEY_ADVANCED_DEVICES, false);

                .getBoolean(KEY_ADVANCED_DEVICES, defaultAdvanced);

    }

    public static boolean getDisplayFileSize(Context context) {