spi: atmel-quadspi: order header files inclusion alphabetically

Cosmetic change, no functional change.
Signed-off-by: NTudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: NBoris Brezillon <bbrezillon@kernel.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

drivers/spi/atmel-quadspi.c

@@ -22,16 +22,15 @@
  * This driver is based on drivers/mtd/spi-nor/fsl-quadspi.c from Freescale.
  */
 
-#include <linux/kernel.h>
 #include <linux/clk.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
-#include <linux/of.h>
-
 #include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
 #include <linux/spi/spi-mem.h>
 
 /* QSPI register offsets */