usb: dwc3-generic: Restrict single ctrl node for RK3328

Like Rockchip RK3568, the RK3328 also have single node to
represent the glue and ctrl for USB 3.0.

So, use the driver data to use single ctrl for RK3328 DWC3.

Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>