msm: mdss: Add interface for deterministic frame rate control

Deterministic frame rate control feature requires video frame's
timestamp as well as frame count to compute video's cadence, so
add this support in kernel interface.

Change-Id: I44ef35ccf7a93f0dbb5d91b3ed80b52f554045bc
Signed-off-by: Ray Zhang <rayz@codeaurora.org>