ASoC: remove unnecessary header including in SGTL5000 codec driver

Remove unnecessary headers:
 - mach/hardware.h in sgtl5000.c
 - linux/i2c.h in sgtl5000.h

Signed-off-by: Zeng Zhaoming <b32542@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/sgtl5000.c

@@ -27,7 +27,6 @@
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
 #include <sound/initval.h>
-#include <mach/hardware.h>
 
 #include "sgtl5000.h"
 

sound/soc/codecs/sgtl5000.h

@@ -11,8 +11,6 @@
 #ifndef _SGTL5000_H
 #define _SGTL5000_H
 
-#include <linux/i2c.h>
-
 /*
  * Register values.
  */