riscv: Disable ARCH_HAS_DEBUG_VIRTUAL if NOMMU

DEBUG_VIRTUAL should only used when MMU enabled, add the dependence.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
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Kefeng Wang 2020-05-11 10:19:57 +08:00 • committed by Palmer Dabbelt
commit 21e2414083
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