dt-bindings: phy: ti,phy-j721e-wiz: document clock-output-names

Document the clock-output-names property of clock children, even though
the nodes are actually deprecated, to fix dtbs_check warnings like:

  k3-j7200-common-proc-board.dtb: wiz@5060000: refclk-dig: 'clock-output-names' does not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: krzk

Documentation/devicetree/bindings/phy/ti,phy-j721e-wiz.yaml

@@ -89,6 +89,9 @@ properties:
       "#clock-cells":
         const: 0
 
+      clock-output-names:
+        maxItems: 1
+
       assigned-clocks:
         maxItems: 1
 
@@ -122,6 +125,9 @@ patternProperties:
       "#clock-cells":
         const: 0
 
+      clock-output-names:
+        maxItems: 1
+
       assigned-clocks:
         maxItems: 1
 
@@ -150,6 +156,9 @@ patternProperties:
       "#clock-cells":
         const: 0
 
+      clock-output-names:
+        maxItems: 1
+
     required:
       - clocks
       - "#clock-cells"