[U-Boot] [PATCH v4 7/8] pico-imx7d: README: Add BL33 usage case

[sbabic at denx.de]

> Add Documentation of BL33 usage case. U-boot is in
> non-secure world in this case.
> Signed-off-by: Jun Nie <jun.nie at linaro.org>

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

Best regards,
Stefano Babic

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