imx8mn: Update the DDR4 timing script on imx8mn ddr4 evk

On i.MX8MN, we can only support DLL-ON mode only, so update the timing
to support 2400mts & 1066mts setpoint.

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