mgw: Announce and rebind new local address if change required during MDCX

MDCX may provide a new remote address, which means we may need to update
our announced IP addr and re-bind our local end. This can happen for
instance if MGW initially provided an IPv4 during CRCX ACK, and now MDCX
tells us the remote has an IPv6 address.

Change-Id: Iaed424e2c209e1753e1f579752fc684aaad7a512
1 file changed