Implements the 'content type' property for HDMI connectors.
Verified by checking the avi infoframe on a connected TV.

This also simplifies a lot of the code in that area as well, there were
a lot of temp variables doing very little and unnecessary logic
that was quite confusing.

It is not necessary to check for support in the EDID before sending a
'content type' value in the avi infoframe also.

v2:
- rebase to amd-staging-drm-next
- mark CRTC state for reset if content_type differs

Reviewed-by: Harry Wentland <harry.wentland@amd.com> (v1)
Signed-off-by: Joshua Ashton <joshua@froggi.es>
Co-developed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>