usb: dwc3-generic: Use combined glue and ctrl node for RK3588

Like Rockchip RK3328 and RK3568, the RK3588 also have a single node to
represent the glue and ctrl for USB 3.0.

Use rk_ops as driver data to select correct ctrl node for RK3588 DWC3.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Marek Vasut <marex@denx.de>