dt-bindings: bluetooth: reference serial-peripheral-props.yaml

Reference common serial properties schema (for children of UART
controllers) to bring common definition of "current-speed" and
"max-speed" properties.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240811-dt-bindings-serial-peripheral-props-v1-5-1dba258b7492@linaro.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/net/bluetooth/qualcomm-bluetooth.yaml

@@ -98,8 +98,7 @@ properties:
   vddwlmx-supply:
     description: VDD_WLMX supply regulator handle
 
-  max-speed:
-    description: see Documentation/devicetree/bindings/serial/serial.yaml
+  max-speed: true
 
   firmware-name:
     description: specify the name of nvm firmware to load
@@ -118,6 +117,7 @@ additionalProperties: false
 
 allOf:
   - $ref: bluetooth-controller.yaml#
+  - $ref: /schemas/serial/serial-peripheral-props.yaml#
   - if:
       properties:
         compatible: