xiaomi: add xiaomi-iot domains (#3097)

- Add account.xiaomi.com for OAuth2 authentication
- Add ha.api.io.mi.com for HTTP API
- Add miot-spec.org for MIoT specification API
- Add cn-ha.mqtt.io.mi.com for MQTT broker

data/xiaomi

@@ -1,5 +1,6 @@
 include:xiaomi-ads
 include:xiaomi-ai
+include:xiaomi-iot
 
 mgslb.com
 mi-idc.com

data/xiaomi-iot

@@ -0,0 +1,5 @@
+# Xiaomi IoT Services
+account.xiaomi.com
+cn-ha.mqtt.io.mi.com
+ha.api.io.mi.com
+miot-spec.org