Porting of Linux to Lenovo Yoga Book laptops (YB1-X9* and C930).

Links:
jekhor's project: https://github.com/jekhor/yogabook-linux
XDA forum thread: https://forum.xda-developers.com/t/linux-mint-18-3-for-lenovo-yoga-book-yb1-x91f-iso-request-for-help.38