board/lx2160a: Fix MC firmware loading for SD boot

During boot, u-boot reads MC, DPL, DPC firmware from SD card
and copies to DDR. Update DDR addresses to which these firmwares
are copied as per memory map of these firmwares on SD-card
so that isolation between the regions of various firmwares
is maintained to avoid geting overwritten.

Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com>
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>