Don't save the anonymous identity for EAP-SIM/AKA/AKA-Prime

wpa_supplicant can update this value when authenticating so if the
framework writes it back the new value can be overwritten.

TEST: Patch was validated by original reporter
      Enterprise tests pass (b/29608435)

Change-Id: If359b4ca625371fbdb68177c7cdb6498c3a519a1
Fixes: 28161335

(cherry picked from commit a464a9fce8d160d2bbac3aeea3b23ecc7bb179a0)
1 file changed