[SERIAL] Remove unnecessary serial.h include

imx.c does not use anything from serial.h, so remove it.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-imx/mx1ads.c

@@ -27,7 +27,6 @@
 #include <asm/mach/arch.h>
 #include <linux/interrupt.h>
 #include "generic.h"
-#include <asm/serial.h>
 
 static struct resource cs89x0_resources[] = {
 	[0] = {