[RPi] 安裝EW-7822ULC/UTC無線網卡

這篇寫得很清楚，但我忘記要先紀錄步驟了 QQ

https://edimax.freshdesk.com/support/solutions/articles/14000062079-how-to-install-ew-7822ulc-utc-adapter-on-raspberry-pi