add headers to Kbuild

Change-Id: I155749d779c9d4ff4cdc9ef451c11cbd07d457f7
Merge branch 'andromadus' of https://github.com/Andromadus/htc7x30-3.0 into ubuntu-touch-vision
Flinny fixed Kbuild in his repo as well.
Revert "Add new header files to Kbuild so they get installed correctly"
Flinny added the headers as well, but at a different location, so revert this.

This reverts commit 421c02a8c950b6abd813969a1c481e77b5ea3926.