drm/msm: cleanup display drivers to restore upstream files

Display downstream drivers are moved to techpack project.
Cleanup the following dead driver codes and restore the
upstream files for drm/msm folder. Compilation verified
by making minimal downstream changes to address adreno
and touch driver references.

Drivers getting removed:
	drm/msm/sde
	drm/msm/dp
	drm/msm/display-staging/
	clk/qcom/mdss/
	media/platform/msm/sde/rotator

Change-Id: I443ea8be2c0af049747ba33c85b02af4bf6d9a02
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>