gowin: recognize partnumbers of GW1NZ-1
gowin: recognize partnumbers of GW1NZ-1

The model should be recognized by the partnumber, --family is needed
only if the same partnumbers belong to different models.
This is done in order to automatically generate parameters for calling
nextpnr from Gowin files without problems: there also only partnumber is
used and only in some cases the model is specified with the -name
parameter and GW1NZ-1 is not such a case.

Signed-off-by: YRabbit <6d0ebbbdce32474db8141d23d2c01bd9628d6e5f@yrabbit.cyou>

YosysHQ/nextpnr,YosysHQ/nextpnr,YosysHQ/nextpnr,YosysHQ/nextpnr