Necessary AccessPoint visibility change for WifiNetworkDetailsFragment.

Refactor constant name in WifiTracker for readability.

Bug: 34713316
Test: runtest --path
frameworks/base/packages/SettingsLib/tests/integ/src/com/android/settingslib/wifi/AccessPointTest.java
runtest --path
frameworks/base/packages/SettingsLib/tests/integ/src/com/android/settingslib/wifi/WifiTrackerTest.java

Change-Id: I41b0d69303d0452e2c2c22bcbddc34ae3932e99e
2 files changed