drm/xe: Remove special casing for LR queues in submission

drm/xe: Remove special casing for LR queues in submission

Now that LR jobs are tracked by the DRM scheduler, there's no longer a
need to special-case LR queues. This change removes all LR
queue-specific handling, including dedicated TDR logic, reference
counting schemes, and other related mechanisms.

v4:
 - Remove xe_exec_queue_lr_cleanup tracepoint (Niranjana)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Link: https://patch.msgid.link/20260110012739.2888434-6-matthew.brost@intel.com