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/manroland/mpc5200-common.h b/include/configs/manroland/mpc5200-common.h
index 21b17f6..60e8716 100644
--- a/include/configs/manroland/mpc5200-common.h
+++ b/include/configs/manroland/mpc5200-common.h
@@ -12,8 +12,7 @@
  * High Level Configuration Options
  * (easy to change)
  */
-#define CONFIG_MPC5xxx		1	/* This is an MPC5xxx CPU		*/
-#define CONFIG_MPC5200		1	/* (more precisely an MPC5200 CPU)	*/
+#define CONFIG_MPC5200		1	/* MPC5200 CPU */
 
 #define CONFIG_SYS_MPC5XXX_CLKIN	33000000 /* ... running at 33.000000MHz	*/