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/MPC8548CDS.h b/include/configs/MPC8548CDS.h
index eef1b1e..842afe1 100644
--- a/include/configs/MPC8548CDS.h
+++ b/include/configs/MPC8548CDS.h
@@ -13,6 +13,9 @@
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
+#define CONFIG_SYS_GENERIC_BOARD
+#define CONFIG_DISPLAY_BOARDINFO
+
 #ifdef CONFIG_36BIT
 #define CONFIG_PHYS_64BIT
 #endif