This is a working version before add grt function.
Revert "This is a working version before add grt function."

This reverts commit d96c1e83ca0d6a5fe9dc9c41d00b69dc052d6baf.
Revert "Revert "This is a working version before add grt function.""

This reverts commit 6085a8107e140c0611f105bb017515473099070a.
Working version of ath9k with grt hardware support