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: NSamuel Holland <samuel@sholland.org>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NMaxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220203013558.11490-1-samuel@sholland.orgSigned-off-by: NVinod 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: