staging: iio: ad9832: organize includes

Organize includes to list them in lexicographic order.
Signed-off-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/frequency/ad9832.c

@@ -5,22 +5,24 @@
  * Copyright 2011 Analog Devices Inc.
  */
 
+#include <asm/div64.h>
+
 #include <linux/device.h>
+#include <linux/err.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
-#include <linux/sysfs.h>
 #include <linux/spi/spi.h>
-#include <linux/regulator/consumer.h>
-#include <linux/err.h>
-#include <linux/module.h>
-#include <asm/div64.h>
+#include <linux/sysfs.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
-#include "dds.h"
 
 #include "ad9832.h"
 
+#include "dds.h"
+
 /* Registers */
 
 #define AD9832_FREQ0LL		0x0