Add 5G icon in manual network selection.

Manual network selection need to have 5G icon when 5G signal is
available.

Bug: 143995814
Test: 1. Build pass.
2. check UI:
3-1. Open APN settings page: Settings > Network & Internet > Mobile Network > Advanced > Access Point Names
3-2. Turn off Automatically select network

Change-Id: I3664105d3bf52e3694a2274c6aa76a755de4e1dd