[PATCH] tools: imx8m_image: Support ddr3 firmware

[sbabic at denx.de]

> Some boards use ddr3, not ddr4, so we need to check ddr3 firmware.
> Signed-off-by: Ariel D'Alessandro <ariel.dalessandro at collabora.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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