drop features 'core-location-area-code' and 'core-cell-identity'

This feature apparently assigned a fixed LAC and CI to a specific MSC, but
looking at the implementation was obviously not useful.

Keep the vty commands for legacy compat, now without effect besides logging an
error via vty_out().

Related: OS#4751
Change-Id: I6bee704e7e5d5b6b86473323bae1fa9fce9241ee
5 files changed