drm/radeon/radeon_connectors: use struct drm_edid instead of struct edid

drm/radeon/radeon_connectors: use struct drm_edid instead of struct edid

This was done with amdgpu, just bringing the same patch to radeon.

The goal of this is to stop using the deprecated edid functions,
specifically drm_connector_update_edid_property. Switch to struct
drm_edid and the appropriate function replacements for the new type.

Also, for audio, use the raw edid for SADB allocations and for
equivalent drm_edid_is_digital expressions.

Signed-off-by: Joshua Peisach <jpeisach@ubuntu.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>