[ARM] fix pnx4008 build errors

include/linux/i2c-pnx.h was missed when moving the include files.
Fix it now; it doesn't really need to include mach/i2c.h at all.
Successfully build tested with pnx4008_defconfig, which had
failed in linux-next.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

include/linux/i2c-pnx.h

@@ -12,7 +12,9 @@
 #ifndef __I2C_PNX_H__
 #define __I2C_PNX_H__
 
-#include <asm/arch/i2c.h>
+#include <linux/pm.h>
+
+struct platform_device;
 
 struct i2c_pnx_mif {
 	int			ret;		/* Return value */