disp: msm: sde: disable vsync_in to update tear check

This change updates the single buffer tear check registers
when vsync_in is disabled. It allows mode switch frame
trigger as posted start frame trigger.

Change-Id: I8068736b2ea01f6e4160e765fc39d7fc2a8590c9
Signed-off-by: Dhaval Patel <quic_pdhaval@quicinc.com>
Signed-off-by: Jayaprakash Madisetty <quic_jmadiset@quicinc.com>