[U-Boot] imx: Add variscite DART-6UL Evaluation Kit

[sbabic at denx.de]

> Port for the DART-6UL Evaluation Kit SBC. Based on the variscite
> DART-6UL iMX6ULL SoM.
> CPU:   Freescale i.MX6ULL rev1.1 900 MHz (running at 396 MHz)
> CPU:   Commercial temperature grade (0C to 95C) at 43C
> Reset cause: POR
> Model: Variscite DART-6UL Evaluation Kit
> Board: Variscite DART-6UL Evaluation Kit
> DRAM:  512 MiB
> MMC:   FSL_SDHC: 0, FSL_SDHC: 1
> In:    serial at 02020000
> Out:   serial at 02020000
> Err:   serial at 02020000
> Net:   FEC0
> Working:
>  - Eth0
>  - i2c
>  - MMC/SD
>  - eMMC
>  - USB host
>  - UART 1
> Note: LCDIF porting needs DM_VIDEO
> https://lists.denx.de/pipermail/u-boot/2019-April/365506.html
> Signed-off-by: Parthiban Nallathambi <parthitce at gmail.com>

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

Best regards,
Stefano Babic

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