phy: dt-bindings: cdns,dphy: Add compatible for dphy on j721e

Add compatible to support dphy tx on j721e
Signed-off-by: Rahul T R <r-ravikumar@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220623125433.18467-2-r-ravikumar@ti.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/cdns,dphy.yaml

@@ -11,8 +11,9 @@ maintainers:
 
 properties:
   compatible:
-    items:
-      - const: cdns,dphy
+    enum:
+      - cdns,dphy
+      - ti,j721e-dphy
 
   reg:
     maxItems: 1