Fixed IMS network disconnected when data disabled

When evaluating data network, also check if the not
allowed reasons are soft reasons. If yes, check if
data networks are unmetered or restricted uses.

Also using capabilities instead of APN type when
doing unmetered check.

Test: Manual + atest DataNetworkControllerTest
Fix: 218485054

Change-Id: Ie58c08653b390589764d2ab03c196b400c5345db