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Add KUnit tests for helper functions, IRQ table management paths, and DRM mock-backed CRTC lookup in amdgpu_dm_irq.c. Tests cover: - amdgpu_dm_hpd_to_dal_irq_source(): all HPD types 1-6, AMDGPU_HPD_NONE, and out-of-range values - are_sinks_equal(): NULL inputs, signal mismatch, EDID length mismatch, EDID data mismatch, identical sinks, zero-length EDID, full-length identical EDID, and a single trailing-byte difference - dmub_notification_type_str(): notification type mappings that are always built, plus the unknown/default case - amdgpu_dm_irq_init(): low/high handler list initialization - amdgpu_dm_irq_register_interrupt(): NULL input rejection, invalid context/source rejection, low/high handler insertion, multiple handlers on one source, and the same handler registered in both low and high contexts - amdgpu_dm_irq_unregister_interrupt(): invalid source and NULL handler rejection, removal of registered low/high handlers, and the handler-not-found path - amdgpu_dm_irq_fini(): cleanup of registered low/high handlers and the empty-table case - amdgpu_dm_get_crtc_by_otg_inst(): DRM mock CRTC list match, no-match, and empty-list paths Assisted-by: Copilot:Claude-Opus-4 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>