linux-phytec-fsl

workqueue: add system_freezeable_wq

Add system wide freezeable workqueue.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>