Merge Misc DSS clean ups from Archit

This series does the following things:

- Remove passive matrix LCD support: There are no panel drivers with
  passive matrix LCD drivers in DSS2. There are no passive matrix panels
  even available to test with DSS. Since no one is using passive matrix
  panels, stop trying to support it. It cleans up the DSS driver.

- Add some new fields to omap_video_timings: There were some standard
  panel timing fields missing from omap_video_timings. Namely
  Hsync/Vsync/DE levels and interlace. Add these to omap_video_timings
  to align it more with xorg modeline. Add some other OMAP DSS specific
  fields to omap_video_timings.

- Remove some hacks done because omap_video_timings didn't have the
  above fields.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>