powerpc: convert selected boards to generic board structure

Convert MPC8540ADS, MPC8541CDS, MPC8544CDS, MPC8548CDS, MPC8555CDS,
MPC8560ADS, MPC8568MDS, MPC8569MDS, MPC8610HPCD to use generic board
structure.

Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/include/configs/MPC8540ADS.h b/include/configs/MPC8540ADS.h
index 931816b..a42c936 100644
--- a/include/configs/MPC8540ADS.h
+++ b/include/configs/MPC8540ADS.h
@@ -18,6 +18,9 @@
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
+#define CONFIG_SYS_GENERIC_BOARD
+#define CONFIG_DISPLAY_BOARDINFO
+
 /* High Level Configuration Options */
 #define CONFIG_BOOKE		1	/* BOOKE */
 #define CONFIG_E500		1	/* BOOKE e500 family */