msm: kgsl: Update initial HWCG values

Fix the values used for initial HWCG setup.
This HWCG value must be changed because it
affected system RW buffer functionality.

Change-Id: I004a73488d7ce11cede1f3e0db3be5c9a7285bd9
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>