dt-bindings: leds: lp55xx: allow label

The Linux driver and at least one upstream board use 'label' property:

  qcom/msm8996-xiaomi-gemini.dtb: lp5562@30: 'label' does not match any of the regexes: '^led@[0-8]$', '^multi-led@[0-8]$', 'pinctrl-[0-9]+'
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221127204058.57111-3-krzysztof.kozlowski@linaro.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/leds/leds-lp55xx.yaml

@@ -48,6 +48,8 @@ properties:
     description: |
       GPIO attached to the chip's enable pin
 
+  label: true
+
   pwr-sel:
     $ref: /schemas/types.yaml#/definitions/uint8
     description: |