drm/edid: Move dvi_dual/max_tmds_clock to drm_display_info

drm/edid: Move dvi_dual/max_tmds_clock to drm_display_info

We have the drm_display_info for storing information about the sink, so
let's move dvi_dual and max_tmds_clock in there.

v2: Deal with superfluous code shuffling
    Document dvi_dual and max_tmds_clock too

Cc: Alex Deucher <[email protected]>
Cc: "Christian König" <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: Christian König <[email protected]> (v1)
Reviewed-by: Alex Deucher <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]