uboot-imx

powerpc/p1023rdb: Enable configs to use generic board code

Add configs:
  o CONFIG_SYS_GENERIC_BOARD
  o CONFIG_DISPLAY_BOARDINFO
in P1023RDB config header file to use U-boot generic
board code.

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