drm/amd/display: add KUnit tests for DM atomic state helpers

[WHAT]
Add KUnit tests for the DM atomic private-state accessors
(dm_atomic_get_new_state, dm_atomic_destroy_state), the native
cursor-mode selector (dm_should_update_native_cursor) and
amdgpu_dm_smu_write_watermarks_table. Cover the empty and matching
private-object lookups, the NULL-context destroy path, the NULL,
native and overlay cursor-mode paths, and the non-Navi1x watermark
table early return.

Assisted-by: Copilot:Claude-Opus-4.8
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

0 files changed, 0 insertions, 0 deletions