drm/msm/sde: add resource management for writeback and cdm

Add resource management control for writeback and cdm hadware drivers.
This enables sharing of hardware resources among multiple controlling
components.

Change-Id: Ieac1058b4ccb6a59c934c3ad5053dae20ca8c4e5
Signed-off-by: Alan Kwong <akwong@codeaurora.org>