drm/msm: add timestamp param

We need this for GL_TIMESTAMP queries.

Note: currently only supported on a4xx.. a3xx doesn't have this
always-on counter.  I think we could emulate it with the one CP
counter that is available, but for now it is of limited usefulness
on a3xx (since we can't seem to do time-elapsed queries in any sane
way with the existing firmware on a3xx, and if you are trying to do
profiling on a tiler you want time-elapsed).  We can add that later
if it becomes useful.

Change-Id: Ic0dedbad46a7cb22391de89ed2341a5a378e1bb0
Signed-off-by: Rob Clark <robdclark@gmail.com>
Git-commit: 6c77d1abe61797239533918d7a0336fc84f4aef1
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>