ARM: OMAP3: remove duplicated #include

Removed duplicated #include in arch/arm/mach-omap2/board-rx51.c.
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-rx51.c

@@ -15,7 +15,6 @@
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/delay.h>
 #include <linux/gpio.h>
 
 #include <mach/hardware.h>