msm: vidc: Do not set device bus vote data to default in __unvote_buses

During s/w power collapse, we unvote for bus during suspend and
should vote for same bus data during resume.
Without this change we end up voting for default bus data after
resume.

Change-Id: I9bd84e4e339788ab94ad3cbe975b25ba496f006f
Signed-off-by: Sowmya Pandiri <spandiri@codeaurora.org>