Remove blocking binder call to WifiManager

In CarrierTextManager#updateCarrierText(), remove deprecated, blocking
binder call to get the current Wi-Fi state. Instead, use
NetworkController, which keeps the SIM state updated asynchronously.

Test: adb shell cmd wifi set-wifi-enabled enabled / disable
Test: QSCarrierGroupControllerTest
Bug: 275317488
Change-Id: Idefd12c37961e43365a6eca341db92035b35b611