msm: vidc: Remove unused code

Voting/unvoting for NOC need not be exposed above
venus HFI interface and it is not being used either.
So, clean up this code.

Change-Id: I6f66869f921e20d369634e8facf53b88a7c2822d
Signed-off-by: Vinay Kalia <vkalia@codeaurora.org>