tests: Skip EAP-pwd and EAP-FAST test cases if not supported

tests: Skip EAP-pwd and EAP-FAST test cases if not supported

Check wpa_supplicant EAP capability and skip EAP-pwd and EAP-FAST test
cases if the build did not include support for these. This is cleaner
than reporting failures for such test cases when the selected TLS
library does not support the EAP method.

Signed-off-by: Jouni Malinen <j@w1.fi>