Convert dataDuringCall to autoDataSWitch

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