[PATCH v1] mach-imx: nandbcb: improve cmd help

[sbabic at denx.de]

> From: Igor Opaniuk <igor.opaniuk at toradex.com>
> Add info about supported i.MX7, improve details the usage of
> bcbonly subcommand.
> Signed-off-by: Igor Opaniuk <igor.opaniuk at toradex.com>
> Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov at toradex.com>
Applied to u-boot-imx, -next, thanks !

Best regards,
Stefano Babic

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