dt-bindings: leds: qcom,spmi-flash-led: Add PMI8998

Document compatible for PMI8998 Torch and Flash LED controller.
Signed-off-by: Dylan Van Assche <me@dylanvanassche.be>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230518133113.273880-2-me@dylanvanassche.beSigned-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/leds/qcom,spmi-flash-led.yaml

@@ -27,6 +27,7 @@ properties:
           - qcom,pm8150l-flash-led
           - qcom,pm8350c-flash-led
           - qcom,pm8550-flash-led
+          - qcom,pmi8998-flash-led
       - const: qcom,spmi-flash-led
 
   reg: