LinuxKPI: 802.11: CONFIG_PM_SLEEP / WoWLAN header adjustments

Sort out some (though not yet all) changes needed for CONFIG_PM_SLEEP
and respectively WoWLAN support (so we can compile it in). This is
just one further step towards proper suspend/resume support.

Sponsored by: The FreeBSD Foundation

(cherry picked from commit b42c339c59fd00f2d97f6854b17b54b340019d0c)