drm/msm/sde: use vsync source information from interfaces

Currently TE/Vsync source information is provided by SDE driver.
As TE comes from panel, it should be provided by the panel to
avoid any mismatch.

CRs-Fixed: 2254681
Change-Id: Ib906cd85cfa954cec211b4cc36fb6f524a78af02
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>