[PATCH 2/2] doc: board: phytec: add phycore_imx8mp

[sbabic at denx.de]

> Add documentation on how to build a bootable U-Boot image for the PHYTEC
> phyCORE-i.MX 8M Plus.
> Signed-off-by: Yannic Moog <y.moog at phytec.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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