std_cache: Decouple Valid/Dirty WE from Data WE #522

Job	Run time
riscv-tests (asm-tests, cv64a6_imafdc_sv39)	40m 24s
riscv-tests (asm-tests, cv64a6_imafdcsclic_sv39)	37m 23s
riscv-tests (mul, cv64a6_imafdc_sv39)	10m 38s
riscv-tests (mul, cv64a6_imafdcsclic_sv39)	11m 14s
riscv-tests (amo, cv64a6_imafdc_sv39)	25m 48s
riscv-tests (amo, cv64a6_imafdcsclic_sv39)	40m 41s
riscv-tests (fp, cv64a6_imafdc_sv39)	14m 44s
riscv-tests (fp, cv64a6_imafdcsclic_sv39)	11m 46s
riscv-tests (benchmarks, cv64a6_imafdc_sv39)	33m 26s
riscv-tests (benchmarks, cv64a6_imafdcsclic_sv39)	24m 25s
riscv-tests (clic, cv64a6_imafdcsclic_sv39)	6m 40s
riscv-tests (hyp, cv64a6_imafdcsclic_sv39)	9m 56s
	4h 27m 5s

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