disp: msm: sde: update encoder atomic check during qsync usecase

During wb/cwb usecases, connectors_changed flag will be
set and needs modeset condition will be set to true. This
change updates qsync concurrency check with modeset to
fail atomic check only if there is seamless poms, dms or
dynamic clock scenario.

Change-Id: I1183f25cd45310fbd1d0b5ce67ee3d5dd3660fe0
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>