drm/amd/display: CTS 4.2.2.7

[Why]
Failure to read Detailed Capabilities Info.

[How]
Read Detailed Capbilities Info 80h-08Fh.

Signed-off-by: abdoulaye berthe <abdoulaye.berthe@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>