Add a config to hide the 3G option at preferred network mode UI

Add a config config_display_network_mode_3g_option to hide the 3G
option at preferred network mode UI

Bug: 261615630
Test: build pass. local test pass.
atest EnabledNetworkModePreferenceControllerTest

Change-Id: I4f94971add1d1eddc9f7c7458b8fc8fdcec3935e
(cherry picked from commit f7685dd7)
Merged-In: I4f94971add1d1eddc9f7c7458b8fc8fdcec3935e