drm/msm: Change the profiling structure

Remove the queued time from the profile struct and turn the submit time
into a proper timespec (tv_sec + tv_nsec).  This should sync up better
with what userspace is used to seeing.

Change-Id: Ic0dedbad0621fa248e6cffde2d1ee3f9b609e19d
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>