drm/amd/display: Add kdoc params/returns in dc/link detection helpers

drm/amd/display: Add kdoc params/returns in dc/link detection helpers

The link detection helpers in dc/link/link_detection.c were missing
kdoc annotations for parameters and return values.

Fixes the below with gcc W=1:
...link_detection.c:872 parameter 'edid_header' not described
...link_detection.c:890 parameter 'link' not described
...link_detection.c:914 parameter 'link' not described
...link_detection.c:1355 parameter 'link' not described
...link_detection.c:1355 parameter 'type' not described

Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Roman Li <roman.li@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>