msm: kgsl: Disable gpu_llc flags by default

Set default value of flags gpu_llc_slice_enable and
gpuhtw_llc_slice_enable to false and disable change
via sysfs nodes.

Change-Id: I1446a04b25a793cdebf5428de2e84870a6b33b7c
Signed-off-by: Rohan Sethi <rohsethi@codeaurora.org>