drm/amd/display: Hook up 'content type' property for HDMI

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 <[email protected]> (v1)
Signed-off-by: Joshua Ashton <[email protected]>
Co-developed-by: Melissa Wen <[email protected]>
Signed-off-by: Melissa Wen <[email protected]>
Acked-by: Alex Deucher <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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