drm/msm/sde: validate de-interlace and scalar concurrency

In de-interlace video plus scalar concurrency case-
pipe fetch, unpack output and scalar block input number of lines
should match. Otherwise, it will lead to hang. Added check to
validate this condition.

Change-Id: I00453dda36b5291948b99d0f0a89105b6875c039
Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>