Condition dcache_ctrl to MMU_PRESENT #1558

Job	Run time
riscv-tests (asm-tests, cv64a6_imafdc_sv39)	1h 7m 13s
riscv-tests (asm-tests, cv64a6_imafdc_sv39_wb)	1h 7m 31s
riscv-tests (mul, cv64a6_imafdc_sv39)	34m 32s
riscv-tests (mul, cv64a6_imafdc_sv39_wb)	35m 57s
riscv-tests (amo, cv64a6_imafdc_sv39)	38m 45s
riscv-tests (amo, cv64a6_imafdc_sv39_wb)	46m 50s
riscv-tests (fp, cv64a6_imafdc_sv39)	46m 45s
riscv-tests (fp, cv64a6_imafdc_sv39_wb)	1h 9m 19s
riscv-tests (benchmarks, cv64a6_imafdc_sv39)	43m 57s
riscv-tests (benchmarks, cv64a6_imafdc_sv39_wb)	31m 21s
	8h 2m 10s

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