msm: kgsl: Make DCVS vote HFI messages blocking

The DCVS HFI has an setting to either be blocking
or nonblocking. Switch all DCVS HFI messages to be
blocking. This fixes potential instability.

Change-Id: I617a7a47d1ab37d49d844dfd8c148e7512c54b2e
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>