Setting this bit restores all ring contexts in parallel rather than
serially.  Matches current BWG recommendations.
Tested-by: N"Meng, Mengmeng" <mengmeng.meng@intel.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: NDeepak S <deepak.s@inel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>