dt-bindings: usb: vialab,vl817: remove reset-gpios from required list

The "reset-gpios" is optional in real case, for example reset pin is
is hard wired to "high". And this fact is also reflected by the
devm_gpio_get_optional() calling in driver code.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231018150448.1980-1-jszhang@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/vialab,vl817.yaml

@@ -37,7 +37,6 @@ properties:
 required:
   - compatible
   - reg
-  - reset-gpios
   - vdd-supply
   - peer-hub