dt-bindings: bluetooth: qcom,qca9377-bt: Split to separate schema

One big Qualcomm Bluetooth schema is hardly manageable: it lists all
possible properties (19 supplies). Split qcom,qca9377-bt to separate
bindings, so device schema will be easier to read/maintain and list only
relevant properties.

Existing binding has incomplete and incorrect list of supplies (e.g.
there is no VDD_XO) and Linux driver does not ask for any, thus keep
this state unchanged.

Reviewed-by: Rob Herring (Arm) <[e-mail]>
Reviewed-by: Bjorn Andersson <[e-mail]>
Reviewed-by: Bartosz Golaszewski <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Luiz Augusto von Dentz <[e-mail]>

Documentation/devicetree/bindings/net/bluetooth/qcom,qca9377-bt.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/bluetooth/qcom,qca9377-bt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm QCA9377 Bluetooth
+
+maintainers:
+  - Balakrishna Godavarthi <[e-mail]>
+  - Rocky Liao <[e-mail]>
+
+properties:
+  compatible:
+    enum:
+      - qcom,qca9377-bt
+
+  clocks:
+    items:
+      - description: External low-power 32.768 kHz clock input
+
+  enable-gpios:
+    maxItems: 1
+
+  vddio-supply:
+    description: VDD_IO supply regulator handle
+
+  vddxo-supply:
+    description: VDD_XO supply regulator handle
+
+required:
+  - compatible
+  - clocks
+  - enable-gpios
+
+allOf:
+  - $ref: bluetooth-controller.yaml#
+  - $ref: qcom,bluetooth-common.yaml
+  - $ref: /schemas/serial/serial-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    serial {
+        bluetooth {
+            compatible = "qcom,qca9377-bt";
+            clocks = <&rk809 1>;
+            enable-gpios = <&gpio3 5 GPIO_ACTIVE_HIGH>;
+            max-speed = <2000000>;
+            pinctrl-names = "default";
+            pinctrl-0 = <&bt_enable>;
+            vddio-supply = <&vcc_1v8>;
+            vddxo-supply = <&vcc3v3_sys>;
+        };
+    };

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

···
 properties:
   compatible:
     enum:
-      - qcom,qca9377-bt
       - qcom,wcn3950-bt
       - qcom,wcn3988-bt
       - qcom,wcn3990-bt