drm/amd/display: Drop redundant amdgpu_dm_irq tests

[WHAT]
Thirteen tests in the amdgpu_dm_irq suite only re-ran a path that
another test already covered, and five more repeated setup that the
fixtures added by the preceding patches now provide.

[HOW]
Delete the tests whose executed path is a strict subset of
another's, and fold the remaining duplicated setup onto the shared
fixtures.

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: George Zhang <george.zhang@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