Staging: rt2860: enable WPA_SUPPLICANT support

This is needed in order to get NetworkManager to work properly
with this driver.

More details can be found at
	https://bugzilla.novell.com/show_bug.cgi?id=437959



Cc: Helmut Schaa <hschaa@novell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>