[MIPS] SN: PCI fixup needs to include <irq.h>.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/pci/fixup-sni.c

@@ -14,6 +14,8 @@
 #include <asm/mipsregs.h>
 #include <asm/sni.h>
 
+#include <irq.h>
+
 /*
  * PCIMT Shortcuts ...
  */