dt-bindings: net: bluetooth: Add device tree bindings for QCA9377

QCA9377 is a QCA ROME device frequently found in Android TV boxes.

Signed-off-by: Christian Hewitt <[e-mail]>
Signed-off-by: Marcel Holtmann <[e-mail]>

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

···
 Required properties:
  - compatible: should contain one of the following:
    * "qcom,qca6174-bt"
+   * "qcom,qca9377-bt"
    * "qcom,wcn3990-bt"
    * "qcom,wcn3991-bt"
    * "qcom,wcn3998-bt"
···
  - enable-gpios: gpio specifier used to enable chip
  - clocks: clock provided to the controller (SUSCLK_32KHZ)
  - firmware-name: specify the name of nvm firmware to load
+
+Optional properties for compatible string qcom,qca9377-bt:
+
+ - max-speed: see Documentation/devicetree/bindings/serial/serial.yaml
 
 Required properties for compatible string qcom,wcn399x-bt: