Remove empty MNC filtering when retrieving available subscriptions

During the early phase of work on DSDS, we found that a hacky solution
to seeing duplicate subscriptions that are part of a logical group (eg
Google Fi) was to filter out the entries with empty MNC strings. It
turns out this breaks things for some legitimate eSIM subsctiptions, and
isn't needed anymore because of the fixes that landed for b/127833821.

Fixes: 130706446
Test: make RunSettingsRoboTests
Change-Id: Ic4472c1de3c3e2449139b3e2ffb20d11a0058e8a

src/com/android/settings/network/SubscriptionUtil.java

@@ -101,16 +101,6 @@ public class SubscriptionUtil {
                 }
             }
         }
-
-        // With some carriers such as Google Fi which provide a sort of virtual service that spans
-        // across multiple underlying networks, we end up with subscription entries for the
-        // underlying networks that need to be hidden from the user in the UI.
-        for (Iterator<SubscriptionInfo> iter = subscriptions.iterator(); iter.hasNext(); ) {
-            SubscriptionInfo info = iter.next();
-            if (TextUtils.isEmpty(info.getMncString())) {
-                iter.remove();
-            }
-        }
         return subscriptions;
     }
 }