Update search for mobile network settings

This CL make all mobile related preferences support:
1. If subId is manually set, check visibility by subId
2. If not, try find whether there is one active subId meets requirement.
If so, isAvailable() will return true to enable search.

Bug: 77276236
Test: RunSettingsRoboTests
Change-Id: I24e2d2f5e882284ba8e997b844caee7722b6b07d