dm: sound: Fix up header ordering

Tidy up the ordering of header files in the sounds files.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/sound/wm8994.c b/drivers/sound/wm8994.c
index a888a0b..1714f43 100644
--- a/drivers/sound/wm8994.c
+++ b/drivers/sound/wm8994.c
@@ -4,15 +4,15 @@
  * R. Chandrasekar <rcsekar@samsung.com>
  */
 #include <common.h>
-#include <asm/arch/clk.h>
-#include <asm/arch/cpu.h>
-#include <asm/gpio.h>
-#include <asm/io.h>
 #include <div64.h>
 #include <fdtdec.h>
 #include <i2c.h>
 #include <i2s.h>
 #include <sound.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/cpu.h>
 #include <asm/arch/sound.h>
 #include "wm8994.h"
 #include "wm8994_registers.h"