Add National Semiconductor components :
- DS75160AN => GPIB Transceiver (data), DIP-20
- DS75160AWM => GPIB Transceiver (data), SOP-20
- DS75161AN => GPIB Transceiver (ctrl), DIP-20
- DS75161AWM => GPIB Transceiver (ctrl), SOP-20
- DS75162AN => GPIB Transceiver (ctrl), DIP-22
- DS75162AWM => GPIB Transceiver (ctrl), SOP-24