drm/xe/xe_guc_submit: Fix exec queue stop race condition

Reorder the xe_sched_tdr_queue_imm and set_exec_queue_banned calls in
guc_exec_queue_stop.  This prevents a possible race condition between
the two events in which it's possible for xe_sched_tdr_queue_imm to
wake the ufence waiter before the exec queue is banned, causing the
ufence waiter to miss the banned state.

Suggested-by: Matthew Brost <[email protected]>
Signed-off-by: Jonathan Cavitt <[email protected]>
Reviewed-by: Matthew Brost <[email protected]>
Reviewed-by: Stuart Summers <[email protected]>
Signed-off-by: Matthew Brost <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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