dt-bindings: net: bluetooth: convert MT7622 Bluetooth to the json-schema

This helps validating DTS files. Introduced changes:
1. Dropped serial details from example
2. Added required example include
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7622-bluetooth.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/bluetooth/mediatek,mt7622-bluetooth.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek SoC built-in Bluetooth
+
+description:
+  This device is a serial attached device to BTIF device and thus it must be a
+  child node of the serial node with BTIF. The dt-bindings details for BTIF
+  device can be known via Documentation/devicetree/bindings/serial/8250.yaml.
+
+maintainers:
+  - Sean Wang <sean.wang@mediatek.com>
+
+allOf:
+  - $ref: bluetooth-controller.yaml#
+
+properties:
+  compatible:
+    const: mediatek,mt7622-bluetooth
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: ref
+
+  power-domains:
+    maxItems: 1
+
+required:
+  - clocks
+  - clock-names
+  - power-domains
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/power/mt7622-power.h>
+
+    serial {
+        bluetooth {
+            compatible = "mediatek,mt7622-bluetooth";
+            power-domains = <&scpsys MT7622_POWER_DOMAIN_WB>;
+            clocks = <&clk25m>;
+            clock-names = "ref";
+        };
+    };

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

-MediaTek SoC built-in Bluetooth Devices
-==================================
-
-This device is a serial attached device to BTIF device and thus it must be a
-child node of the serial node with BTIF. The dt-bindings details for BTIF
-device can be known via Documentation/devicetree/bindings/serial/8250.yaml.
-
-Required properties:
-
-- compatible:	Must be
-		  "mediatek,mt7622-bluetooth": for MT7622 SoC
-- clocks:	Should be the clock specifiers corresponding to the entry in
-		clock-names property.
-- clock-names:	Should contain "ref" entries.
-- power-domains: Phandle to the power domain that the device is part of
-
-Example:
-
-	btif: serial@1100c000 {
-		compatible = "mediatek,mt7622-btif",
-			     "mediatek,mtk-btif";
-		reg = <0 0x1100c000 0 0x1000>;
-		interrupts = <GIC_SPI 90 IRQ_TYPE_LEVEL_LOW>;
-		clocks = <&pericfg CLK_PERI_BTIF_PD>;
-		clock-names = "main";
-		reg-shift = <2>;
-		reg-io-width = <4>;
-
-		bluetooth {
-			compatible = "mediatek,mt7622-bluetooth";
-			power-domains = <&scpsys MT7622_POWER_DOMAIN_WB>;
-			clocks = <&clk25m>;
-			clock-names = "ref";
-		};
-	};
-
 MediaTek UART based Bluetooth Devices
 ==================================