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/hmi1001.h b/include/configs/hmi1001.h
index 1c74a2e..a1a88b5 100644
--- a/include/configs/hmi1001.h
+++ b/include/configs/hmi1001.h
@@ -13,9 +13,8 @@
  * (easy to change)
  */
 
-#define CONFIG_MPC5xxx		1	/* This is an MPC5xxx CPU		*/
-#define CONFIG_MPC5200		1	/* (more precisely an MPC5200 CPU)	*/
-#define CONFIG_HMI1001		1	/* HMI1001 board			*/
+#define CONFIG_MPC5200		1	/* This is an MPC5200 CPU	*/
+#define CONFIG_HMI1001		1	/* HMI1001 board		*/
 
 #ifndef CONFIG_SYS_TEXT_BASE
 #define CONFIG_SYS_TEXT_BASE	0xFFF00000