powerpc/p2041rdb: enable generic board configs

Add following configs in header file:
CONFIG_SYS_GENERIC_BOARD
CONFIG_DISPLAY_BOARDINFO

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

include/configs/P2041RDB.h

@@ -13,6 +13,8 @@
 
 #define CONFIG_P2041RDB
 #define CONFIG_PHYS_64BIT
+#define CONFIG_SYS_GENERIC_BOARD
+#define CONFIG_DISPLAY_BOARDINFO
 #define CONFIG_PPC_P2041
 
 #ifdef CONFIG_RAMBOOT_PBL