[Encrypted IMSI] Use the pseudonym if available

Update the logic to save the pseudonym, in case
a real pseudonym is provided by the EAP server.
This will allow the framework to use it in subsequent
connections, instead of sending anonymous@<realm> and
encrypting the IMSI each time.

Bug: 134775152
Test: Auto-connect to Carrier Wi-Fi
Test: atest ClientModeImplTest
Change-Id: Ie5696f419bc3f5cbc75a39e8a3c0cfa8bfde7021
2 files changed