Fix enum items without a range
Fix enum items without a range

Signed-off-by: Krzysztof Bieganski <ddd4dfe92774295e8f6fc8916e305befa71cc29e@antmicro.com>

SymbiFlow/yosys-symbiflow-plugins,antmicro/yosys-symbiflow-plugins,chipsalliance/yosys-f4pga-plugins,SymbiFlow/yosys-f4pga-plugins,SymbiFlow/yosys-f4pga-plugins,SymbiFlow/yosys-symbiflow-plugins,SymbiFlow/yosys-f4pga-plugins,SymbiFlow/yosys-symbiflow-plugins,antmicro/yosys-symbiflow-plugins,chipsalliance/yosys-f4pga-plugins,antmicro/yosys-symbiflow-plugins