Revert "msm: kgsl: Expose HFI get and set value over sysfs"

This reverts commit 8d80a01a as the
interface to control limits management registers is unnecessary.

Change-Id: I6d66f4ccf57ff88312800e59a633b19e937ec294
Signed-off-by: Mohammed Mirza Mandayappurath Manzoor <mmandaya@codeaurora.org>