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 <christianshewitt@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

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

@@ -10,6 +10,7 @@ device the slave device is attached to.
 Required properties:
  - compatible: should contain one of the following:
    * "qcom,qca6174-bt"
+   * "qcom,qca9377-bt"
    * "qcom,wcn3990-bt"
    * "qcom,wcn3991-bt"
    * "qcom,wcn3998-bt"
@@ -21,6 +22,10 @@ Optional properties for compatible string qcom,qca6174-bt:
  - 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:
 
  - vddio-supply: VDD_IO supply regulator handle.