msm: display: vsync usage in turning off dsi video
Add timeout to waiting for vsync so that it can come out
when vsync interrupt is not working.
Need not wait for vsync after timing engine is off.
CRs-Fixed: 458419
Change-Id: Ib989e435405613d891024ba15144723730454e34
Signed-off-by:
Ken Zhang <kenz@codeaurora.org>
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