imx: add macro to detect whether USB has been initialized
This macro allows to detect whether the boot ROM initialized USB already (serial downloader). This is helpful to reliably detect if the system has been recovered via USB serial downloader. Signed-off-by: NStefan Agner <stefan.agner@toradex.com> Acked-by: NMarcel Ziswiler <marcel.ziswiler@toradex.com>
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