Remove hidden connectivity methods access

This commit resolves the hidden methods accesses for
LinkProperties, IpConfiguration and RouteInfo with atlernative
way for the connectivity mainline module preparation.

Bug: 172183305
Test: make RunSettingsRoboTests ROBOTEST_FILTER=\
com.android.settings.wifi.details2.WifiDetailPreferenceController2Test
Test: make RunSettingsRoboTests ROBOTEST_FILTER=\
com.android.settings.wifi.details.WifiDetailPreferenceControllerTest
Test: make RunSettingsRoboTests ROBOTEST_FILTER=\
com.android.settings.UtilsTest
Test: make RunSettingsRoboTests ROBOTEST_FILTER=\
com.android.settings.wifi.WifiConfigController2Test
Test: make RunSettingsRoboTests ROBOTEST_FILTER=\
com.android.settings.wifi.WifiConfigController2Test

Change-Id: Iec4dab5d9fa12dedcf69a1cfe2a8be0956bc0d79