ARM: ixp4xx: Remove duplicated include from common.c

Remove duplicated include.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-ixp4xx/common.c

@@ -27,7 +27,6 @@
 #include <linux/cpu.h>
 #include <linux/pci.h>
 #include <linux/sched_clock.h>
-#include <linux/bitops.h>
 #include <linux/irqchip/irq-ixp4xx.h>
 #include <linux/platform_data/timer-ixp4xx.h>
 #include <mach/udc.h>