drm/msm/sde: dispatch suspend/resume notification to cp

This change enables the appropriate callbacks to the color
processing component on suspend/resume transitions.

CRs-Fixed: 2019307
Change-Id: I7b8c9eb2b32da42e36d32e9d88e74e0c0c7b1ecb
Signed-off-by: Clarence Ip <cip@codeaurora.org>