The rPLL primitive for the simplest chip (GW1N-1) in the family is
processed. All parameters of the primitive are passed on to gowin_pack,
and general-purpose wires are used for routing outputs of the primitive.
Compatible with older versions of apicula, but in this case will refuse
to place the new primitive.
Signed-off-by: YRabbit <rabbit@yrabbit.cyou>