[Provider Model] Show W+ when connected to Carrier Wi-Fi Network

Sync solution from InternetPanel(ag/14456005 and ag/14934760)

Bug: 199199709
Test:
adb root
adb shell cmd wifi network-suggestions-set-as-carrier-provider com.android.shell yes
adb shell cmd wifi add-suggestion GoogleGuest-Legacy open -a -m -i 2 -c 1989

Change-Id: I933c051138e56a5d08378cc1e51d9a577b3c1eae