drm/amdgpu/amdgpu_connectors: use struct drm_edid instead of struct edid

drm/amdgpu/amdgpu_connectors: use struct drm_edid instead of struct edid

Some amdgpu code is still using deprecated edid functions. Switch to
the newer functions and update the amdgpu_connector struct's edid type
to the drm_edid type.

At the same time, use the raw EDID when we need to for speaker
allocations and for determining if the input is digital.

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