bsc: add mp_enable_lcs_tests := false
Introduce this switch for enabling the Lb interface startup, and first off set
to false everywhere. A later patch will enable Lb where it makes sense.
Depends: Idf463c3c2169cad953b4ebc5b5845b31d5efb848 (osmo-ttcn3-hacks)
Change-Id: Id26064931c482c25217bccdeec866e9afc1fd9b5
