dt-bindings: watchdog: qcom-wdt: document support on SA8255p

Add a compatible for the SA8255p platform's KPSS watchdog.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Nikunj Kela <quic_nkela@quicinc.com>
Link: https://lore.kernel.org/r/20240910165926.2408630-1-quic_nkela@quicinc.comSigned-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/watchdog/qcom-wdt.yaml

@@ -26,6 +26,7 @@ properties:
               - qcom,apss-wdt-msm8994
               - qcom,apss-wdt-qcm2290
               - qcom,apss-wdt-qcs404
+              - qcom,apss-wdt-sa8255p
               - qcom,apss-wdt-sa8775p
               - qcom,apss-wdt-sc7180
               - qcom,apss-wdt-sc7280