ddr: imx9: Change the saved ddr data base to 0x2051c000

change the ddr saved info to the last 16KB of the OCRAM.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>