Fix security isseu by change the field in WifiConfig

Flag: EXEMPT bugfix
Bug: 347912017
Bug: 348352288
Bug: 346289032
Test: atest com.android.server.wifi
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:eca3f190d2a5b6b634224863f5ee5f584babd0dc)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:4c5857fb14004583e3d3ad5d092ad16b956eea64)
Merged-In: I8998340ae557660036895dd906808d682b83c6f0
Change-Id: I8998340ae557660036895dd906808d682b83c6f0