[MemPool-Spatz] Fix git submodule of Spatz. #1332

Job	Run time
check-opcodes	5s
riscv-isa-sim	9s
tc-gcc	29m 50s
tc-llvm	6s
verilator	10s
tc-halide	0s
verilator-model (minpool)	15s
verilator-model (mempool)	21s
build-apps-omp (minpool)	23s
build-apps-gcc (minpool)	32s
build-apps-halide	0s
build-apps-omp (mempool)	23s
build-apps-llvm	0s
build-apps-gcc (mempool)	31s
check-bootrom	22s
unit-test	0s
run-apps-halide	0s
run-apps-llvm	0s
run-apps-gcc	0s
clean-up	1s
clean-up-compile-runs (minpool)	1s
clean-up-compile-runs (mempool)	3s
	33m 12s

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