Remove WorldFIP-bus-termination option
As discussed with the installation team, there is no need to have the
option of adding on-board a WorldFIP termination.
Connecting by mistake the termination or a failure of the relay have a high risk with the respect to the advantages of having this feature.
Also traces could potentially affect the bus impedance.
TODO: Remove RL3, T2, R15 and TERM_EN_N signal.