dt-bindings: usb: sunxi-musb: Add Allwinner D1 compatible

The MUSB controller in the Allwinner D1 has 10 endpoints, making it
compatible with the A33 variant of the hardware.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220702195249.54160-2-samuel@sholland.org

Documentation/devicetree/bindings/usb/allwinner,sun4i-a10-musb.yaml

@@ -20,6 +20,7 @@ properties:
       - items:
           - enum:
               - allwinner,sun8i-a83t-musb
+              - allwinner,sun20i-d1-musb
               - allwinner,sun50i-h6-musb
           - const: allwinner,sun8i-a33-musb
       - items: