msm: kgsl: Fix direct references to HZ

Make the various timeout values HZ agnostic by using the proper
macros and values instead.

Change-Id: I906b948657c8873518042c7465272c98c5391e59
Signed-off-by: Suman Tatiraju <sumant@codeaurora.org>
Signed-off-by: Ajay Dudani <adudani@codeaurora.org>