[Provider Model] Enforce DISALLOW_CONFIG_WIFI in Internet Panel

- Avoid the appearance of WiFi-related strings in sub-title

- Hide all of Wi-Fi related views

- Do not scan Wi-Fi result

Bug: 195669955
Test: manual test
atest -c InternetDialogControllerTest \
         InternetDialogTest

Change-Id: I5c19e6a8e52d2c9207053ffb7539d931d1f04799