msm: kgsl: Make DCVS nohfi not use hfi types directly

DCVS uses two different methods to communicate power requests to
the GMU. DCVS will either use HFI to send requests to the GMU which
will be responsible for writing the correct registers or KMD will
write the registers directly. If the later (ie nohfi mode), there
is no need to setup HFI packets and then extract data out of them.
Instead just do the writes directly.

Change-Id: I6dd733db1133e49a6c6d6631080621c2ff311c90
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>