msm: mdss: Retain register settings across suspend/resume
The post-processing effects go away on target suspend. Therefore,
cache the register values of CCS, and retain them on target
resume.
Change-Id: I65c1306b4eb7ff62272c8fbc34faba6602352fad
Signed-off-by:
Lei Zhou <leizhou@codeaurora.org>
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