[U-Boot] [U-Boot,V2,4/5] pico-imx7d: Convert DM MMC

[sbabic at denx.de]

> This patch enable convert DM MMC for imx7d-pico board and variant.
> Before the DM conversion only usdhc3 was enabled and therefore it appeared
> as MMC 0 to u-boot. After enabling MMC DM though usdhc3 defaults to MMC 2,
> which left unattended would drive changes to existing pico-pi bootscripts and
> environment variables that rely on mmc 0.
> Setup the alias of mmc0 and usdhc3 so that existing pico-imx7d boot code will
> work unmodified.
> When converting to DM_MMC it is necessary that SPL initializes eMMC
> by itself, so move the original eMMC initialization from U-Boot
> proper to SPL.
> Signed-off-by: Joris Offouga <offougajoris at gmail.com>
> Signed-off-by: Fabio Estevam <festevam at gmail.com>

Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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