staging: ath6kl: Adding state in driver to track the sme state

Adding state in driver to track the sme state. The connect/disconnect
events from the driver were messing up the state maintained within the
cfg80211 module.

Signed-off-by: Vipin Mehta <vmehta@atheros.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>