arm: ls1021a: Add CONFIG_DOS_PARTITION and CONFIG_CMD_FAT support

This patch will fix the bug that the partitions on the SD card could
not be accessed and add the support for the FAT fs.

Signed-off-by: Alison Wang <alison.wang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
2 files changed