dt-bindings: leds: intel,lgm: Add missing 'led-gpios' property

The example has 'led-gpio' properties, but that's not documented. As the
'gpio' form is deprecated, add 'led-gpios' to the schema and update the
example.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20221207204327.2810001-1-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/leds/leds-lgm.yaml

@@ -64,6 +64,9 @@ properties:
             minimum: 0
             maximum: 2
 
+          led-gpios:
+            maxItems: 1
+
           intel,sso-hw-trigger:
             type: boolean
             description: This property indicates Hardware driven/control LED.
@@ -118,14 +121,14 @@ examples:
           reg = <0>;
           function = "gphy";
           color = <LED_COLOR_ID_GREEN>;
-          led-gpio = <&ssogpio 0 0>;
+          led-gpios = <&ssogpio 0 0>;
         };
 
         led@2 {
           reg = <2>;
           function = LED_FUNCTION_POWER;
           color = <LED_COLOR_ID_GREEN>;
-          led-gpio = <&ssogpio 23 0>;
+          led-gpios = <&ssogpio 23 0>;
         };
       };
     };