msm: kgsl: Remove direct GMU DTCM access from CPU

Remove direct DTCM access on HFI enabled targets.
Otherwise were writing over some good data in GMU DTCM.

Change-Id: Ib9bc83bf1d5ee4fb77be9094199d501143f51176
Signed-off-by: Oleg Perelet <operelet@codeaurora.org>