usb: dwc3: Use an ordered workqueue for sm_work

The sm_work needs to be queued on an ordered workqueue.
The create_freezable does not ensure the ordered attribute
needed.
Hence, use the alloc_ordered_workqueue instead of it
with the flags WQ_FREEZABLE and WQ_MEM_RECLAIM.

Change-Id: I535cb826f117b0162efb87639c85d7b1634a441a
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>