[Patch V3 42/44] ddr: Add DDR driver for iMX8ULP

[sbabic at denx.de]

> From: Ye Li <ye.li at nxp.com>
> Add iMX8ULP DDR initialization driver which loads the DDR timing
> parameters and executes the training procedure.
> When enabling IMX8ULP_DRAM_PHY_PLL_BYPASS, using PHY PLL bypass mode
> to do DDR init
> Signed-off-by: Ye Li <ye.li at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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