Multi otg wait for uuu.
There is a new nxp i.mx chip imx8mp(aka. mx865), it supports super speed at uboot. Super speed and high speed use different logical port even physical port is the same.
In a word, for this special platform, uuu need to wait an extra logical port, then the old format is -m 3:3, while for this new chip, it will be -m 3:3 -m <super speed port>.
So, we need to change uuu_usb_otg_path from string to list to support this.