[U-Boot] [U-Boot,v2,14/23] apalis_imx6: add distroboot support

[sbabic at denx.de]

> From: Marcel Ziswiler <marcel.ziswiler at toradex.com>
> Add support for distro boot. This is especially helpful for external
> devices. There is a global boot command which scans a predefined
> list of boot targets:
>   run distro_bootcmd
> As well as direct boot commands such as:
>   run bootcmd_mmc1
>   run bootcmd_mmc2
>   run bootcmd_usb
>   run bootcmd_dhcp
>   ...
> Refer to doc/README.distro for details.
> While at it, remove the CONFIG_DRIVE_TYPES define which has not
> been used and was meant to be used for multi device boot support
> which is now provided by distroboot.
> Signed-off-by: Stefan Agner <stefan.agner at toradex.com>
> Acked-by: Max Krummenacher <max.krummenacher at toradex.com>
> Acked-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>

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

Best regards,
Stefano Babic

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