Changes in V4
=
1) Add module parameter for freesync video mode
* Change module parameter name to freesync_video
2) Add freesync video modes based on preferred modes:
* Cosmetic fixes
* Added comments about all modes being added by the driver.
3) Skip modeset for front porch change
Changes in V3
=
1) Add freesync video modes based on preferred modes:
* Cache base freesync video mode during the first iteration to avoid
iterating over modelist again later.
* Add mode for 60 fps videos
2) Skip modeset for front porch change
* Fixes for bug exposed by caching of
