The feature is enabled via
TelephonyManager.MOBILE_DATA_POLICY_AUTO_DATA_SWITCH. The feature only
applies to non-DDS. If enabled, we automatically switch to the non-DDS for data traffic when it has better availability than the DDS.
The UI change are(as required by b/247880971):
1. data during call is replaced by auto data switch, and moved under
mobile data toggle.
2. Network & internet and Internet page now show the currently active
subscription, instead of the defalut subscription. If the currently
active sub is not the default, it's reflected in summary as
"temporarily".
Test: manual
Bug: 244064524
Change-Id: Ica1eba99cee0d4af528d58f1c7bd1439400bfa66
4e7f783906