Add 5G icon to System UI

This add the 5G and 5G+ icon to the system UI for 5G Non-Standalone
network.

System UI uses the ServiceState & CarrierConfig to determine whether and
which 5G icon should be displayed in 5G Non-Standalone network.

Bug: 111497313, 111453000
Test: build & manually test
Merged-In: I6fba0f9c42fff3cb1398895b122f18f13de239f7
Change-Id: I6fba0f9c42fff3cb1398895b122f18f13de239f7