[ARM] pxa/em-x270: remove duplicated #include

Remove duplicated #include in arch/arm/mach-pxa/em-x270.c.
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Acked-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Eric Miao <eric.miao@marvell.com>

arch/arm/mach-pxa/em-x270.c

@@ -28,7 +28,6 @@
 #include <linux/spi/libertas_spi.h>
 #include <linux/power_supply.h>
 #include <linux/apm-emulation.h>
-#include <linux/delay.h>
 
 #include <media/soc_camera.h>