ULCB-KF has a USB2.0 dual-role channel (CN13).
This adds dr_mode property for USB2.0 channel 0 (EHCI/OHCI and HS-USB)
as "otg".
Signed-off-by: NVladimir Barinov <vladimir.barinov@cogentembedded.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>