Condition dcache_ctrl to MMU_PRESENT #1557

Job	Run time
riscv-tests (asm-tests, cv64a6_imafdc_sv39)	1h 50m 47s
riscv-tests (asm-tests, cv64a6_imafdc_sv39_wb)	1h 27m 19s
riscv-tests (mul, cv64a6_imafdc_sv39)	35m 34s
riscv-tests (mul, cv64a6_imafdc_sv39_wb)	38m 15s
riscv-tests (amo, cv64a6_imafdc_sv39)	47m 10s
riscv-tests (amo, cv64a6_imafdc_sv39_wb)	54m 54s
riscv-tests (fp, cv64a6_imafdc_sv39)	1h 4m 18s
riscv-tests (fp, cv64a6_imafdc_sv39_wb)	47m 16s
riscv-tests (benchmarks, cv64a6_imafdc_sv39)	32m 39s
riscv-tests (benchmarks, cv64a6_imafdc_sv39_wb)	45m 53s
	9h 24m 5s

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