remove gen folder from repo

Change-Id: Ie1e6cba49ad9c20a8191bdfb5c80e2cf749d92f6
Remove Gen folder

Change-Id: I558e16df9987bbde3a11c623de582db560c47e00
update .gitignore file to remove gen folder

Change-Id: I7d764ac17342a93ab789605c4f513da6abdf51c5