lx2162a : Rename emmc boot command variable

Rename emmc_bootcmd environment variable to sd2_bootcmd
to fix emmc boot on lx2162aqds board.

Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
1 file changed