Input: ixp4xx-beeper - fix compile error

Signed-off-by: NAlessandro Zummo <a.zummo@towertech.it>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>

drivers/input/misc/ixp4xx-beeper.c

@@ -19,6 +19,7 @@
 #include <linux/input.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
+#include <linux/interrupt.h>
 #include <asm/hardware.h>
 
 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");