riscv: mm: Use better bitmap_zalloc()

Use better bitmap_zalloc() to allocate bitmap.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
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Kefeng Wang 2021-05-29 19:15:34 +08:00 • committed by Palmer Dabbelt
commit 5def4429ae
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