drm/xe: Don't emit extra MI_BATCH_BUFFER_END in WA batchbuffer

The MI_BATCH_BUFFER_END is already added automatically by
__xe_bb_create_job(); including it in the construction of the workaround
batchbuffer results in an unnecessary duplicate.

Link: https://lore.kernel.org/r/20230329173334.4015124-4-matthew.d.roper@intel.com


Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>