m68k: switch to using the asm-generic hw_irq.h

We don't need a local hw_irq.h, switch to using the asm-generic version.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/include/asm/Kbuild

@@ -7,6 +7,7 @@ generic-y += emergency-restart.h
 generic-y += errno.h
 generic-y += exec.h
 generic-y += futex.h
+generic-y += hw_irq.h
 generic-y += ioctl.h
 generic-y += ipcbuf.h
 generic-y += irq_regs.h

arch/m68k/include/asm/hw_irq.h

-#ifndef __ASM_M68K_HW_IRQ_H
-#define __ASM_M68K_HW_IRQ_H
-
-/* Dummy include. */
-
-#endif