i2c: i2c-mux: sort includes

I request this for drivers, so the core should adhere to sorted includes as
well.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index 00fc5b1..d402287 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -19,13 +19,13 @@
  * warranty of any kind, whether express or implied.
  */
 
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
+#include <linux/acpi.h>
 #include <linux/i2c.h>
 #include <linux/i2c-mux.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/of.h>
-#include <linux/acpi.h>
+#include <linux/slab.h>
 
 /* multiplexer per channel data */
 struct i2c_mux_priv {