PCI: pciehp: Handle push button event asynchronously

PCI: pciehp: Handle push button event asynchronously

commit 486b10b9f43500741cd63a878d0ef23cd87fc66d upstream.

Use non-ordered workqueue for attention button events.

Attention button events on each slot can be handled asynchronously. So
we should use non-ordered workqueue. This patch also removes ordered
workqueue in pciehp as a result.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>