Add new states to support wpa_supplicant 0.8

Latest supplicant introduces the INTERFACE_DISABLED state. This
is entered when the interface is brought down (which is effectively
done by us and tracked already through the driver stop operation)

Also, added is a state for tracking authentication when supplicant acts as
the SME

Change-Id: I76090068d0ebba6df76f16707da559fcbd7512c5