xc2bit: Implement not-fully-tested FB writing to crbit for "type 2"
xc2bit: Implement not-fully-tested FB writing to crbit for "type 2"

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