WifiStateMachine: ignore auth-fail event during WPS connection

Disregard auth failure events during WPS connection. The EAP sequence is
retried several times, and there might be failures (especially for wps pin).
We will get a WPS_XXX event at the end of the sequence anyway.

Without this change, the SupplicantStateTracker class will disable
the WPS network we are connecting to after 2 failed authentication events.
Then, even if WPS succeeds, we will never connect to the selected network.

Change-Id: I57c8e508bfd738405b7f2c2c2325df7838e1b4af
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Vishal Mahaveer <vishalm@ti.com>