msm: camera: isp: enforce halt and stop camera when close

During close node, ISP need to be stopped.
Enforce VBIF clock to make sure halt can go through.
Even halt is already issued, it will be safer
if we further issue stop camif to cover any case
halt failed.

Change-Id: I33efbb3e121ef1653dbb80402bb399a0323b6f61
Signed-off-by: Peter Liu <pingchie@codeaurora.org>