Handling data registration and radio technology changing. DO NOT MERGE.

When the DataRegistrationState (aka DRS) or RilDataRadioTechnology changes
aka Radio Access Technology or RAT) while retrying the DataConnection
StateMachine will return the connection as lost immediately. This allows
the connection to be retried with the correct handling of the changed
DRS or RAT quickly, rather than having to wait until retires are exhausted.

Changes:

- Pass RAT in bringUp
- Add the capability to register for DRS/RAT changes with SST
- When DRS/RAT changes in DcRetryState return LOST_CONNECTION to DcTracker

Bug: 9069568
Change-Id: I897168baf17ecaedd0f1df4ef3c2263066d70ece