gp4par: Added more routes to DAC DIN. Still need to work out vref refactoring.
gp4par: Added more routes to DAC DIN. Still need to work out vref refactoring.

azonenberg/openfpga,rqou/openfpga,azonenberg/openfpga,azonenberg/openfpga,rqou/openfpga,azonenberg/openfpga,rqou/openfpga,rqou/openfpga,azonenberg/openfpga,rqou/openfpga