RFC: validate rework

Closed John Stultz requested to merge john.stultz/drm-hwcomposer:rfc-validate-rework into master

Current status of my validate rework. Still need some better sense of how Planning really should work (on HwcLayers instead of DrmHwcLayers, or on both?), as well as how to re-Plan to correct when things go wrong.

Edited by John Stultz

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