drm/xe/trace: improve xe_sched_msg trace

Also include the gt_id, that way we can ignore duplicate guc_id across
different GTs when applying some filtering.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241122161914.321263-4-matthew.auld@intel.com