drm/amd/amdgpu: Add independent hang detect work for user queue fence

drm/amd/amdgpu: Add independent hang detect work for user queue fence

In error scenarios (e.g., malformed commands), user queue fences may never
be signaled, causing processes to wait indefinitely. To address this while
preserving the requirement of infinite fence waits, implement an independent
timeout detection mechanism:

1. Initialize a hang detect work when creating a user queue (one-time setup)
2. Start the work with queue-type-specific timeout (gfx/compute/sdma) when
       the last fence is created via amdgpu_userq_signal_ioctl (per-fence timing)
3. Trigger queue reset logic if the timer expires before the fence is signaled

v2: make timeout per queue type (adev->gfx_timeout vs adev->compute_timeout vs adev->sdma_timeout) to be consistent with kernel queues. (Alex)
v3: The timeout detection must be independent from the fence, e.g. you don't wait for a timeout on the fence
        but rather have the timeout start as soon as the fence is initialized. (Christian)
v4: replace the timer with the `hang_detect_work` delayed work.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Jesse Zhang <jesse.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>