operator-overlay: Set a new config for threshold bandwidth to enable 4G+

* Set the default value to 0 to mimic the behavior of
Android 10 that didn't have that threshold yet.
* Override the default value for other operators based on
requirement.

Issue: FP3-A11#170
Issue: FP3-A11#231
Change-Id: I82dc08cc58b60bac75d096c19511ad4499dda330
1 file changed