drm/amd/amdgpu: Fix stack frame size warnings in KUnit tests

[WHAT]
Replace stack-allocated large structs with kunit_kzalloc() in KUnit
test functions that exceed the kernel 1280-byte stack frame limit.
Also add CONFIG_FRAME_WARN=1024 to .kunitconfig to enforce the limit.

Affected structs and files:
- struct dc_link in amdgpu_dm_connector_test.c and
  amdgpu_dm_mst_types_test.c
- struct drm_plane, drm_plane_state, drm_framebuffer in
  amdgpu_dm_plane_test.c
- struct drm_connector_state, drm_atomic_state in
  amdgpu_dm_mst_types_test.c
- struct dm_connector_state in amdgpu_dm_test.c

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202606230825.9qMV9L0g-lkp@intel.com/
Assisted-by: Copilot:Claude-Opus-4.6
Acked-by: George Zhang <george.zhang@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

0 files changed, 0 insertions, 0 deletions