[Wi-Fi] Fix robolectric test broken

1. WifiConfigController#setSelection triggers onItemSelect, it uses
   mEapUserCertSpinner without adapter.
2. refreshSummary should use parameter preference instead of mPreference.

Bug: 140771897
Test: WifiConfigControllerTest
      WifiWakeupPreferenceControllerTest

Change-Id: I963260bd82e7387052cacae89bdbe46da841e341