drm/xe: destroy clients engine and vm xarrays on close

xe_file_close cleanups the xarrays but forgets
to destroy them causing a memleak in xarray internals.
Found with kmemleak.

Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Christoph Manszewski <christoph.manszewski@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>