m68k: remove stale ARCH_SUN4 #define

m68k: remove stale ARCH_SUN4 #define
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/asm-m68k/sbus.h

@@ -12,8 +12,6 @@ struct sbus_dev {
 	} reg_addrs[1];
 };
 
-#define ARCH_SUN4  0
-
 /* sbus IO functions stolen from include/asm-sparc/io.h for the serial driver */
 /* No SBUS on the Sun3, kludge -- sam */