mx8mq_usb_work.conf: load dtb/bl31
mx8mq_usb_work.conf: load dtb/bl31

imx8mq still does not boot u-boot, but it will probably require
a u-boot code change to get it working.

Signed-off-by: Troy Kisky <debfc29e3a9e989b865b88f1f207951588bac6b3@boundarydevices.com>

boundarydevices/imx_usb_loader,bwalle/imx_usb_loader