Call overlay_set even if there are no change in params

* Call overlay_set even if there are no change
  in mdp_overlay params.
* Remove mPPChanged and mLkgo variables and associated
  functions.
* This is needed because there is no value add in
  avoiding set calls when there are no change in params.
  This also helps us in avoiding hal hacks where we
  need to force call overlay_set due to driver issues.

Change-Id: Ib626acbdce93185ff037c9581d07bbe428f5f159
2 files changed