dt-bindings: watchdog: qcom-wdt: do not allow fallback alone

The compatible "qcom,kpss-wdt" is too generic and should not be used
alone.  Mark it as deprecated when not prepended by specific compatible.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20221212163532.142533-2-krzysztof.kozlowski@linaro.orgSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

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

@@ -31,9 +31,10 @@ properties:
               - qcom,apss-wdt-sm8150
               - qcom,apss-wdt-sm8250
           - const: qcom,kpss-wdt
+      - const: qcom,kpss-wdt
+        deprecated: true
       - items:
           - enum:
-              - qcom,kpss-wdt
               - qcom,kpss-timer
               - qcom,kpss-wdt-apq8064
               - qcom,kpss-wdt-ipq8064