m68knommu: create hw_irq.h

Need an include/asm-m68knommu/hw_irq.h for kernel/hrtimer.c
Signed-off-by: NGreg Ungerer <gerg@uclinux.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/asm-m68knommu/hw_irq.h

+#ifndef __M68KNOMMU_HW_IRQ_H__
+#define __M68KNOMMU_HW_IRQ_H__
+
+#endif /* __M68KNOMMU_HW_IRQ_H__ */