video: mdss: LiveDisplay driver

 * Provide a simple color temperature adjustment interface via MDSS PCC.
 * Provide hardware integration support for CABC, SRE, and CE.

Change-Id: I4ed1f3876767dd6bedccaf0bbf61af7d36730ca0

video: mdss: Add new features and improve LiveDisplay

 * Add support for auto contrast optimization.
 * Add preset support.
 * Presets are arbitrary sets of DSI commands (defined in the DT) which
   can be used for implementing device-specific modes.
 * This adds the "preset" and "num_presets" sysfs nodes.
 * The preset at position zero is always applied.
 * Completely reworked the way we send commands to the hardware. Now we
   create a single DSI command buffer and send the whole thing at once.

Change-Id: I9b986593cf42b65a3360dae474d8318406b48204

video: mdss: Cache LiveDisplay RGB settings when display off

 * We should avoid waking up the hardware if not necessary-
   but unfortunately even if we do, we might not get a valid
   result when querying for the current PCC settings.
 * Get rid of this code and keep track of the desired values
   ourselves, and reapply it during wakeup.

Change-Id: I1d42842af0d044e241dcc5b9266be0db4f84800b

video: mdss: Fix dual-DSI issue in LiveDisplay

 * The second controller won't have it's own framebuffer, so don't
   dereference a NULL pointer.

Change-Id: I0d0c1475882eb65c8d5bc69c9ac3776b5d60339f

video: mdss: Implement PCC combining for LiveDisplay

 * If we send calibration data via ioctl, we want to make sure
   it's preserved when applying RGB offsets via LiveDisplay.
 * Add support for combining the values, using the calibrated
   PCC value as a scaling factor.

Change-Id: I33a5678a858f5e1c609709b4e7e901c792fd2590

video: mdss: Simplify PCC combiner even more

 * We shouldn't return zero from this.

CYNGNOS-460

2015-12-27	Steve Kondik	video: mdss: Improve the LiveDisplay driver
2016-05-06	Ethan Chen	video: mdss: livedisplay: Fix livedisplay MODE_RGB functionality
2016-05-16	Scott Mertz	video: mdss: remove erroneous mutex_unlock
2016-05-05	Zhao Wei Liew	mdss: livedisplay: Use CABC command chain for CE
2017-06-19	Michael Bestas	mdss: livedisplay: Wrap to 80 chars per line and fix code style

Change-Id: I181a878d442e55e930c1a9532c40c84c3a9b1361