[Provider mode] Display network type on mobile data preference.

 Connect to 5G mobile network
  - https://screenshot.googleplex.com/8RziSbSjstMaFiK
 Connect to Wi-Fi
  - https://screenshot.googleplex.com/6ND3DFFsnLKSQRd

Bug: 176141828
Test: Manual test passed.
Test: Atest passed

Change-Id: I69b8ce0c1f5a16f0ff492be0b4ab26166a51bdc3