msm: cvp: Fix a cvp BW over-voting problem

Incorrect unit of BW vote was used by CVP driver when voting
for DDR bandwidth. Fix the issue in this change.

Change-Id: I916f54750fa6b9858a02a50a851cf83e2e06c8b1
Signed-off-by: George Shen <sqiao@codeaurora.org>