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

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

arch/m68k/include/asm/Kbuild

@@ -23,6 +23,7 @@ generic-y += resource.h
 generic-y += scatterlist.h
 generic-y += sections.h
 generic-y += siginfo.h
+generic-y += spinlock.h
 generic-y += statfs.h
 generic-y += topology.h
 generic-y += types.h

arch/m68k/include/asm/spinlock.h

-#ifndef __M68K_SPINLOCK_H
-#define __M68K_SPINLOCK_H
-
-#error "m68k doesn't do SMP yet"
-
-#endif