powerpc: mpc5xxx: remove redundant CONFIG_MPC5xxx definition

We do not have to define CONFIG_MPC5xxx in board config headers
(and start.S) because it is defined in arch/powerpc/cpu/mpc5xxx/config.mk.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/include/configs/BC3450.h b/include/configs/BC3450.h
index 377db7b..802e9cc 100644
--- a/include/configs/BC3450.h
+++ b/include/configs/BC3450.h
@@ -22,8 +22,7 @@
 /*
  * High Level Configuration Options
  */
-#define CONFIG_MPC5xxx		1	/* This is an MPC5xxx CPU	    */
-#define CONFIG_MPC5200		1	/* (more precisely a MPC5200 CPU)   */
+#define CONFIG_MPC5200		1	/* This is a MPC5200 CPU	    */
 #define CONFIG_TQM5200		1	/* ... on a TQM5200 module	    */
 
 #define CONFIG_BC3450		1	/* ... on a BC3450 mainboard	    */