Update mCid in DataConnection for enterprise connection.

For the case when default data connection is not already present.
This is needed because the data needs to be torn down, and that
needs cid as a parameter.

Test: verified in IODT
Bug: 191915455
Bug: 191751408
Change-Id: Ib061d730f473b2812a9af47a1bf2230c6bf9d2d7