Mark MQTT as service (#152899)

homeassistant/components/mqtt/manifest.json

@@ -6,6 +6,7 @@
   "config_flow": true,
   "dependencies": ["file_upload", "http"],
   "documentation": "https://www.home-assistant.io/integrations/mqtt",
+  "integration_type": "service",
   "iot_class": "local_push",
   "quality_scale": "platinum",
   "requirements": ["paho-mqtt==2.1.0"],

homeassistant/generated/integrations.json

@@ -4168,7 +4168,7 @@
           "name": "Manual MQTT Alarm Control Panel"
         },
         "mqtt": {
-          "integration_type": "hub",
+          "integration_type": "service",
           "config_flow": true,
           "iot_class": "local_push",
           "name": "MQTT"