Check for timers when checking isCampedOn5G

Prevents a false positive when the device isn't camped on 5G, but the
5G icon is showing. During this time, TEMP_NOT_METERED is still active.
Also move the detection logic to DCT, since TEMP_NOT_METERED is set in
DataConnection only through DCT.

Test: atest NetworkTypeControllerTest, DcTrackerTest
Bug: 178774415
Change-Id: Icbf8f8e57122a1c7f1abffe4b8b6b1a1be97ecbb
Merged-In: Icbf8f8e57122a1c7f1abffe4b8b6b1a1be97ecbb