[PATCH] m68knommu hardirq.h include cache.h

The patch include cache.h in m68knommu hardirq.h.

Cleans up compile problems, and make its consistent with
all other architecture hardirq.h files.

include/asm-m68knommu/hardirq.h

@@ -2,6 +2,7 @@
 #define __M68K_HARDIRQ_H
 
 #include <linux/config.h>
+#include <linux/cache.h>
 #include <linux/threads.h>
 
 typedef struct {