[Intel-gfx] [PATCH v2] Displayport compliance testing

[Todd Previte]

>This patch set adds the foundational support for Displayport compliance testing in the
>i915 driver. It implements the framework for automated test support that preclude the
>need (most) for operator input during testing. Tests for AUX transactions, EDID reads
>and basic link training have also been included, along with any support and utility
>functions required. Some changes have also been made to existing code to accommodate
>compliance testing.

V2:
- Addressed review feedback from the mailing list
- Broke up patches into smaller, easily managed chunks
- Reordered the patches such that they can be applied in order
- Fixed checkpatch.pl errors across the patchset  
- Updated and enhanced functionality for the EDID test function
- Completely revamped the mode set operations for compliance testing