[PATCH] ddr: imx8m: Return error values from LPDDR4 training

[sbabic at denx.de]

> From: Frieder Schrempf <frieder.schrempf at kontron.de>
> In cases when the same SPL should run on boards with i.MX8MM, that
> differ in DDR configuration, it is necessary to try different
> parameters and check if the training done by the firmware suceeds or
> not.
> Therefore we return the DDR training/initialization success to the
> upper layer in order to be able to retry with different settings if
> necessary.
> Signed-off-by: Frieder Schrempf <frieder.schrempf at kontron.de>
Applied to u-boot-imx, -next, thanks !

Best regards,
Stefano Babic

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