dt-bindings: display: feiyang,fy07024di26a30d: document port

Panels are supposed to have one port (defined in panel-common.yaml
binding):

  rk3399-rockpro64.dtb: panel@0: 'port' does not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230326204224.80181-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/display/panel/feiyang,fy07024di26a30d.yaml

@@ -26,6 +26,7 @@ properties:
   dvdd-supply:
     description: 3v3 digital regulator
 
+  port: true
   reset-gpios: true
 
   backlight: true
@@ -35,6 +36,7 @@ required:
   - reg
   - avdd-supply
   - dvdd-supply
+  - port
 
 additionalProperties: false
 
@@ -53,5 +55,11 @@ examples:
             dvdd-supply = <&reg_dldo2>;
             reset-gpios = <&pio 3 24 GPIO_ACTIVE_HIGH>; /* LCD-RST: PD24 */
             backlight = <&backlight>;
+
+            port {
+                mipi_in_panel: endpoint {
+                    remote-endpoint = <&mipi_out_panel>;
+                };
+            };
         };
     };