[U-Boot] [U-Boot, 2/2] imx8mq_evk/README: remove ARCH environment variable

[sbabic at denx.de]

> There is no need to set the ARCH variable when building U-Boot. In fact,
> the ARCH name in U-Boot is 'arm'.
> Signed-off-by: Baruch Siach <baruch at tkos.co.il>

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

Best regards,
Stefano Babic

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