drm/edid: Have drm_edid.h include hdmi.h

drm_edid.h depends on hdmi.h on account of enum hdmi_picture_aspect,
so let's just include hdmi.h and drop some useless struct declarations.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170111125725.8086-2-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Eric Anholt <eric@anholt.net>