msm: kgsl: Do not take active_cnt for events and waittimestamp

In the mists of time it was nessesary to take an active count
for waittimestamp and events because we did not want to run
the risk of suspending while the GPU was active.  Now that we
have the dispatcher we have much better control over the GPU
so the original risk is diminished.

The problem is that holding active_cnt prevents us from going
into nap and suspend and with server-side-sync a lot of the
events we are waiting for might take a very long time before
they even get dispatched on the GPU so we are essentially
keeping the clocks on waiting for other people.

z180 must take active count on its own.

Change-Id: Ic0dedbadcb608115938b198faebe333d19c6a8f6
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>