add eap_method and phase2_method string in enterpriseConfig for dump

Currently we don't print any information for eap_method and
phase2_method.
Without this information, it is difficult know that the configuration is
created correctly.

Bug: 123089627
Test: ./frameworks/base/wifi/tests/runtests.sh
Change-Id: I933790a87bd38d4af7438c61f4e12f2e0488d3a1
Signed-off-by: Ecco Park <eccopark@google.com>