dt-bindings: extcon: linux,extcon-usb-gpio: GPIO must be provided

Without providing either ID or VBUS GPIO the driver is not able to operate.
Original text binding says:
"Either one of id-gpio or vbus-gpio must be present."

Fixes: 79a31ce03f41 ("dt-bindings: extcon: convert extcon-usb-gpio.txt to yaml format")
Acked-by: Conor Dooley <[e-mail]>
Signed-off-by: David Heidelberg <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>
Link: https://lore.kernel.org/lkml/[e-mail]/

Documentation/devicetree/bindings/extcon/linux,extcon-usb-gpio.yaml

···
 required:
   - compatible
 
+anyOf:
+  - required:
+      - id-gpios
+  - required:
+      - vbus-gpios
+
 additionalProperties: false
 
 examples: