Update hmi.cpp
Update hmi.cpp

Remove license
itead/ITEADLIB_Arduino_Nextion,itead/ITEADLIB_Arduino_Nextion,itead/ITEADLIB_Arduino_Nextion,itead/ITEADLIB_Arduino_Nextion,FireDeveloper/ITEADLIB_Arduino_Nextion,FireDeveloper/ITEADLIB_Arduino_Nextion