irqchip: mmp: avoid use head file in a specific arch

For example, arm64 doesn't have mach/irq.h.
Signed-off-by: Neil Zhang <zhangwm@marvell.com>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>

drivers/irqchip/irq-mmp.c

@@ -22,7 +22,7 @@
 #include <linux/of_irq.h>
 
 #include <asm/exception.h>
-#include <asm/mach/irq.h>
+#include <asm/hardirq.h>
 
 #include "irqchip.h"