disp: msm: sde: update ds atomic check for pu and cwb

This change fixes the destination scaler atomic check
to support PU with CWB disable without an additional
frame in between. It also fixes the destination height
calculation.

Change-Id: I93ae8471d2db0b4e2574d18a873d4d4e180cbcbb
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>