5G icon timer did't work after physcial channel changed.

NrConnectedState received EVENT_NR_FREQUENCY_CHANGED which NrState
was not NR_STATE_CONNECTED, and then NrConnectedState called
icon changed. This is wrong behavior.

Fix: 157437745
Test: atest NetworkTypeControllerTest.java
Change-Id: Ic9c3deffd1f86ae3d3620994c54d46932a79116c
Merged-In: Ic9c3deffd1f86ae3d3620994c54d46932a79116c