powerpc/t4240rdb: Convert to use generic board code

Signed-off-by: Chunhe Lan <Chunhe.Lan@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

include/configs/T4240RDB.h

@@ -12,6 +12,8 @@
 
 #define CONFIG_T4240RDB
 #define CONFIG_PHYS_64BIT
+#define CONFIG_SYS_GENERIC_BOARD
+#define CONFIG_DISPLAY_BOARDINFO
 
 #define CONFIG_FSL_SATA_V2
 #define CONFIG_PCIE4