[Provider Model] Add Ethernet network to Internet Panel

- Show the Ethernet network to first item of internet panel

- Show the Ethernet network even when airplane mode is turned on

Bug: 192930745
Bug: 192931553
Test: manual test
atest -c InternetDialogControllerTest \
         InternetDialogTest

Change-Id: I5f5b8fa44f9d4b0801684b663b634138c83cff42