add dsp blackbox support for k6n10f
add dsp blackbox support for k6n10f

Signed-off-by: Tarachand Pagarani <4d832e80b775d48ddb5166115a237d525fdad678@quicklogic.com>

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