drm/msm/sde: remove display manager

Convert dsi and wb into actual drivers, and don't bind them
from within the display manager any more. With this change,
the display manager is no longer necessary, and may be safely
removed.

Change-Id: Ifac790fe31120d72cf78000a1476e22d000db4ae
Signed-off-by: Clarence Ip <cip@codeaurora.org>
13 files changed