ASoC: dt-bindings: serial-midi: 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-v1-6-1dba258b7492@linaro.orgSigned-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/sound/serial-midi.yaml

@@ -22,6 +22,9 @@ description:
   configure the clocks of the parent serial device so that a requested baud of 38.4 kBaud
   results in the standard MIDI baud rate, and set the 'current-speed' property to 38400 (default)
 
+allOf:
+  - $ref: /schemas/serial/serial-peripheral-props.yaml#
+
 properties:
   compatible:
     const: serial-midi