[toolchain] Enable zfinx in Banshee configuration #2187

Job	Run time
check-opcodes	4s
riscv-isa-sim	6s
tc-gcc	23s
tc-llvm	50s
verilator	6s
verilator-model (minpool)	6m 24s
verilator-model (mempool)	12m 9s
check-bootrom	9s
build-apps-gcc (minpool)	18s
build-apps-gcc (mempool)	19s
build-apps-llvm (minpool)	35s
tc-halide	7s
build-apps-llvm (mempool)	36s
build-apps-halide (minpool)	41s
build-apps-halide (mempool)	44s
unit-test	2m 13s
run-apps-halide (minpool)	12s
run-apps-gcc	0s
run-apps-halide (mempool)	13s
run-apps-llvm	0s
clean-up	3s
clean-up-compile-runs (minpool)	2s
clean-up-compile-runs (mempool)	4s
	26m 18s

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