MN10300: ASB2305 PCI code needs linux/irq.h

ASB2305 PCI code needs to #include linux/irq.h for XIRQ1 so that it can set
the CPU interrupt priority level on the PCI interrupt.
Signed-off-by: David Howells <dhowells@redhat.com>

arch/mn10300/unit-asb2305/pci.c

@@ -17,6 +17,7 @@
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/delay.h>
+#include <linux/irq.h>
 #include <asm/io.h>
 #include "pci-asb2305.h"