msm_fb: display: Unstage video from primary mixer H/W on unset

Resolve video playback suspend/resume IOMMU page fault by
unstaging video layer on VG pipes from primary mixer H/W during
overlay_unset calls immediately at the next vsync boundary

CRs-Fixed: 350371
Signed-off-by: Ravishangar Kalyanam <rkalya@codeaurora.org>
Change-Id: Ia1b2369005db500b5042d3226cf8d43027783fe3
1 file changed