Revert "drm/msm/sde: move sde encoder to new display interface"

This reverts 'commit 0190e3c9 ("drm/msm/sde: move sde
encoder to new display interface")'
This is partial change for display drm driver,
that will break drm/sde merge commit.

Change-Id: I810da6da7df48bba1df68c81e2843f6597e4ca27
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>