[PATCH V3 5/9] cpu: imx8: reimplement get cpu count

[sbabic at denx.de]

> Return 4 is not correct on i.MX8DX/DXL/8QM and etc. we need to count
> available cpu node with device_type "cpu".
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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