msm: kgsl: Use the CP always on counter for profiling on a6xx targets

Always use the CP always on timer when doing per-command profiling for
a6xx targets. When the GPU is on it is synced to the GMU AO timer and
this prevents us from needing to open up a range in the register
address protection just for these two registers.

Change-Id: Ic0dedbadaa0dd572a8ab184a9a621091dbe9cb2a
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>