dt-bindings: phy: Add compatible for D1 USB PHY

D1 features one OTG port and one host port, like the A64 SoC, so its
USB PHY supports the same set of properties. Add the new compatible to
the existing binding.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220203013558.11490-1-samuel@sholland.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/allwinner,sun50i-a64-usb-phy.yaml

@@ -15,7 +15,9 @@ properties:
     const: 1
 
   compatible:
-    const: allwinner,sun50i-a64-usb-phy
+    enum:
+      - allwinner,sun20i-d1-usb-phy
+      - allwinner,sun50i-a64-usb-phy
 
   reg:
     items: