It is the modem limitation, so disable the preferred network mode UI
during calling.
Bug: 206973375
Test: atest EnabledNetworkModePreferenceControllerTest
Change-Id: Ibb2904b4c6ff6de82063862188cc57e5c14b3aa5
Merged-In: Ibb2904b4c6ff6de82063862188cc57e5c14b3aa5