passpoint-r2: change the status for server connection

Connection status for server is not well-defined.
So, change the status to be meaningful.
Bug: 117728536
Test: ./frameworks/base/wifi/tests/runtests.sh
Test: live test with Passpoint R2 service provider AP
Signed-off-by: Ecco Park <eccopark@google.com>

Change-Id: Ie4dfb3b46926efb26d156bc41bff3709fa60d01e