YC3121 KEYBOARD demo更新，新增适配

Review Request #1206 — Created July 16, 2020 and submitted

Information
wangjingfan
Yc3121
Reviewers
taoqiwen, wushengyan 
1.修改样例demo名称删除旧demo 2.新增适配两套开发板demo 3.整理代码排版




 













 

 














  

 








     

    

   

  

  

   
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