Android Things:Raspberry Pi 3 B 刷入 Android Things

参考文章：

http://www.andtuts.com/a-beginners-guide-to-raspberry-pi-3-b-and-android-things/?utm_source=Android+Weekly&utm_campaign=454d4b53e2-Android_Weekly_239&utm_medium=email&utm_term=0_4eb677ad19-454d4b53e2-337958081