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Add KUnit tests for amdgpu_dm_audio.c. Tests cover: - amdgpu_dm_audio_init(): early exit when audio is disabled - amdgpu_dm_audio_fini(): early exit when audio is not enabled - fill_audio_info(): manufacturer and product ID propagation, display name copy, speaker allocation flags, CEA revision gating of audio mode copying (including the zero-mode case), and latency field propagation - amdgpu_dm_audio_component_bind()/unbind(): component ops, device, and audio_component pointer are wired up on bind and cleared on unbind - amdgpu_dm_audio_eld_notify(): callback is forwarded with the correct port and audio pointer, and the no-op guard paths for a missing component, audio_ops, or pin_eld_notify callback 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: Chenyu Chen <chen-yu.chen@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>