TelephonyDisplayInfo get network type from NetworkTypeController

Prevent network type and override network type mismatch in the race
condition where the override network type is updated and the data rat
changes as we're updating the TelephonyDisplayInfo.
Get the network type from the cached ServiceState value in
NetworkTypeController instead.

Test: atest NetworkTypeControllerTest
Bug: 239184651
Change-Id: I62244d8dc99d742dff284f6a9e14b06527da4cf0