workqueue: allow WQ_MEM_RECLAIM on early init workqueues

Workqueues can be created early during boot before workqueue subsystem
in fully online - work items are queued waiting for later full
initialization.  However, early init wasn't supported for
WQ_MEM_RECLAIM workqueues causing unnecessary annoyances for a subset
of users.  Expand early init support to include WQ_MEM_RECLAIM
workqueues.

Change-Id: Ic9d78be333f4b98be6dd45f04a32ba61bbb877ff
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Git-commit: 40c17f75dfa9ec163478efd3f7443fd6af9992c9
Git-Repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/


Signed-off-by: Prateek Sood <prsood@codeaurora.org>