ppc4xx: Remove IOP480 support

Since the IOP480 (PPC401/3 variant from PLX) is only used on 2
boards that are not actively maintained, lets remove support
for it completely. This way the ppc4xx code will get a bit cleaner.

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/include/common.h b/include/common.h
index 7205677..fb337791 100644
--- a/include/common.h
+++ b/include/common.h
@@ -659,7 +659,7 @@
 }
 #endif
 
-#if defined(CONFIG_4xx) || defined(CONFIG_IOP480)
+#if defined(CONFIG_4xx)
 #  if defined(CONFIG_440)
 #	if defined(CONFIG_440SPE)
 	 unsigned long determine_sysper(void);