nl80211: fixes for event reordering.

Further to the change which added support for key management offload,
this change adds definition for new event used in nl80211 internal queue
and adds structure for information passed with the event. Adds definition
for the processing routine for the event. Adds case for new event defined
above.

CRs-Fixed: 701055
Change-Id: I0e2d08d84c2331af4c16c272d2ba4e0c5a9b7e9b
Signed-off-by: Ahmad Kholaif <akholaif@codeaurora.org>