Revert "sky2: remove check for PCI wakeup setting from BIOS"

This reverts commit 84cd2dfb

.

Some BIOS's break if Wake On Lan is enabled, and the machine
can't boot. Better to have some user's have to call ethtool to
enable WOL than to break a single user's boot.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>