drm/xe/bo: Gracefully handle errors from ttm_bo_move_accel_cleanup().

The function ttm_bo_move_accel_cleanup() attempts to help pipeline a
move, and in doing so, needs memory allocations which may fail.

Rather than failing in a state where the new resource may freed while
accessed by the copy engine, sync uninterruptible and do a failsafe
cleanup.

v2:
- Don't try to attach the signaled fence on ttm_bo_move_accel_cleanup()
  error.

Signed-off-by: Thomas Hellström <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Reviewed-by: Matthew Brost <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Rodrigo Vivi <[email protected]>

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