Check subid when querying network selection

- Manual network selection is not supported for all
global modes, and will automatically switch to automatic
for unsupported modes
- when checking if manual network selection is supported,
we do not check if the subid is active, and the default
network mode is used for DUMMY SUBIDs instead
- If the subid is not active, use the network mode
associated with the phone id instead

Change-Id: I955de159990fab59f7d48f4900c615580763417b
CRs-Fixed: 936605