The wpas_config_file_key_mgmt fails with this error if wpa_supplicant is
built without CONFIG_SUITEB192=y:
Exception: SET_NETWORK failed
Exception: SET_NETWORK failed
Skip the WPA-EAP-SUITE-B-192 case if it is not supported in
wpa_supplicant so that the rest of the key_mgmt test coverage is
included.
Signed-off-by: Masashi Honma <masashi.honma@gmail.com>