Fix the settings crash

When the user select mobile network settings item with subid=-1 in
the search list, then some of objects are not initialized.

Bug: 325956182
Test: atest AutoSelectPreferenceControllerTest
atest MobileNetworkPhoneNumberPreferenceControllerTest
atest MobileNetworkSpnPreferenceControllerTest
atest MobileNetworkImeiPreferenceControllerTest
atest WifiCallingPreferenceControllerTest

Change-Id: I17c24b6f542392f018c65b689862f9735fad4b9f