drm/amd/display: Test MST connector creation

[WHAT]
Add KUnit tests for dm_dp_add_mst_connector() covering successful
connector creation, inheritance of the master connector properties and
the connector init failure path.

[HOW]
Set up an MST topology manager owned by a master amdgpu_dm_connector
plus the mode properties the helper attaches, then add a port and check
the resulting connector, its property values and the encoder links. The
failure path is driven by a mode config without the connector functions
required by drm_connector_init(), and the port reference count is
checked to confirm the error unwind releases it.

Assisted-by: Copilot:Claude-Opus-5
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

0 files changed, 0 insertions, 0 deletions