[DeviceDrivers]Add SFUD(Serial Flash Universal Driver) SPI Flash driver for using RTT device. It makes RT-Thread support more type SPI Flash.

components/drivers/spi/spi_flash_sfud.h

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+/*
+ * File      : spi_flash_sfud.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2016, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2016-09-28     armink       first version.
+ */
+
+#ifndef _SPI_FLASH_SFUD_H_
+#define _SPI_FLASH_SFUD_H_
+
+#include <rtthread.h>
+#include "./sfud/inc/sfud.h"
+
+/**
+ * SPI Flash device initialize by SFUD(Serial Flash Universal Driver) library
+ *
+ * @param rtt_dev the static RT-Thread's flash device object
+ * @param sfud_dev the static SFUD's flash device object
+ *
+ * @return result
+ */
+extern rt_err_t rt_sfud_init(struct spi_flash_device *rtt_flash, sfud_flash *sfud_flash);
+
+#endif /* _SPI_FLASH_SFUD_H_ */