Revert "drm/msm/sde: add seamless dsi panel operating mode transition"

This reverts commit 84f05e71. It
causes stability issues for command mode display bootup with
continuous splash enabled and disabled configuration.

Change-Id: Ic25ecb5c5cea817e39d67fecda60181d6f44e3c6
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>