drm/amd/dc: Add link output control for DPIA

drm/amd/dc: Add link output control for DPIA

[Why]
To support specific sequencing requirements for DPIA link output

[How]
Implement the dpia_link_hwss structure and define the necessary
control function pointers. The initialization order is
aligned with the core link_hwss definition to ensure consistency

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Lincheng Ku <LinCheng.Ku@amd.com>
Signed-off-by: Chuanyu Tseng <chuanyu.tseng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>