Make setupDataCall take a protocol parameter.

Backport the protocol changes to setupDataCall and its
callers from master. As in master, hardcode IPv4
connectivity for now. When we add the protocol field to
ApnSettings, it will be fetched from there.

Bug: 3333633
Change-Id: I51880bc0ec192cbf964ac7bbd6a4b7d2eed41d27