Skip EAP password check for network update

When updating an Enterprise configuration, the password may not be
available because it is assumed that the existing password is still
correct. Therefore, for the update use case, skip password field
checking.

Bug: 195452608
Test: Manual test and verify that Enterprise network updated correctly.
Test: atest WifiConfigurationUtilTest
Change-Id: I104746ed531761a0acc3657f103345258ab70669
2 files changed