dt-bindings: usb: Add binding for Via lab VL817 hub controller

dt-bindings: usb: Add binding for Via lab VL817 hub controller

The VIA Lab VL817 is a USB 3.1 Gen 1 hub and USB 2.0 hub
controller that features 4 downstream ports and 1 otg, with
an internal 5V regulator and has external reset pin.

Add a device tree binding for its USB protocol part.
The internal LDO is not covered by this and can just be modelled
as a fixed regulator.

Add combo of USB 2.0 and USB 3.0 root hub using peer-hub.

Signed-off-by: Anand Moon <linux.amoon@gmail.com>
Link: https://lore.kernel.org/r/20230118044418.875-7-linux.amoon@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>