[software] Add flag to fold q16 MMSE #2157

Job	Run time
riscv-isa-sim	7s
verilator	11s
tc-llvm	48s
check-control-registers	20s
tc-gcc	24s
check-opcodes	5s
verilator-model (minpool)	12s
verilator-model (mempool)	6s
build-apps-gcc (minpool)	1m 38s
check-bootrom	13s
build-apps-gcc (mempool)	1m 25s
unit-test	2m 2s
tc-halide	7s
build-apps-llvm (minpool)	1m 26s
build-apps-llvm (mempool)	1m 17s
build-apps-halide (minpool)	46s
build-apps-halide (mempool)	1m 9s
run-apps-gcc (minpool)	29s
run-apps-gcc (mempool)	2m 29s
run-apps-halide (minpool)	40s
run-apps-halide (mempool)	3m 10s
run-apps-llvm (minpool)	29s
run-apps-llvm (mempool)	2m 32s
clean-up	3s
clean-up-compile-runs (minpool)	3s
clean-up-compile-runs (mempool)	2s
	22m 13s

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