Fix CFU arbitration, add CFU decoder, CFU now redirect custom-0 with func3
Fix CFU arbitration, add CFU decoder, CFU now redirect custom-0 with func3

SpinalHDL/VexRiscv,SpinalHDL/VexRiscv,SpinalHDL/VexRiscv,SpinalHDL/VexRiscv,SpinalHDL/VexRiscv