msm: kgsl: Add the user API definition for timelines

Extend the KGSL uapi for the sempahore timeline APIs,
aux commands and syncobjs.

Change-Id: Ic0dedbadf7338b49da52ab9d0e54d5321217c3fd
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rohan Sethi <rohsethi@codeaurora.org>