Do not clear subscription info during network reset

Only clean the user settings. CarrierConfig and Subscription info only
update with Telephony callbacks.
This fix the issue on R, which will not send CarrierConfig and
Subscription change with network reset.

Bug: 192294208
Test: atest com.android.server.wifi
Test: manually verified on S and R devices
Change-Id: I8704a14f5dd585780bb9e3784da9e373fd9bb99b
2 files changed