imx9: imx93_evk: update ddr timing file

Update DDR timing file generated by DDR Config Tool
1. Dynamic refresh rate is set by default
2. The 3rd freq will be 625MTS based on power and performance better than 100MTS.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>