dt-bindings: usb: dwc3-xilinx: add optional property reset-gpios

Added optional property support reset-gpios for the dwc3-Xilinx
glue driver.

Signed-off-by: Piyush Mehta <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/devicetree/bindings/usb/dwc3-xilinx.yaml

···
         - usb2-phy
         - usb3-phy
 
+  reset-gpios:
+    description: GPIO used for the reset ulpi-phy
+    maxItems: 1
+
 # Required child node:
 
 patternProperties: