Condition dcache_ctrl to MMU_PRESENT #1566

Job	Run time
riscv-tests (asm-tests, cv64a6_imafdc_sv39)	1h 10m 45s
riscv-tests (asm-tests, cv64a6_imafdc_sv39_wb)	1h 17m 8s
riscv-tests (mul, cv64a6_imafdc_sv39)	33m 21s
riscv-tests (mul, cv64a6_imafdc_sv39_wb)	56m 48s
riscv-tests (amo, cv64a6_imafdc_sv39)	57m 45s
riscv-tests (amo, cv64a6_imafdc_sv39_wb)	51m 26s
riscv-tests (fp, cv64a6_imafdc_sv39)	1h 5m 39s
riscv-tests (fp, cv64a6_imafdc_sv39_wb)	50m 14s
riscv-tests (benchmarks, cv64a6_imafdc_sv39)	40m 24s
riscv-tests (benchmarks, cv64a6_imafdc_sv39_wb)	34m 27s
	8h 57m 57s

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