[WHY] The real connector fixture lacks atomic state callbacks required by DRM connector initialization. [HOW] Install the DRM atomic connector duplicate and destroy state helpers alongside the existing reset callback. Assisted-by: Copilot:GPT-6-Astra Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com> Signed-off-by: Alex Hung <alex.hung@amd.com> Signed-off-by: George Zhang <george.zhang@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>