riscv: Add CSR_SMCIR to replace sfence.vma
The sfence.vma may have performance issues, so we use CSR_SMCIR to
replace sfence.vma.
Signed-off-by: 
Guo Ren <guoren@linux.alibaba.com>
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The sfence.vma may have performance issues, so we use CSR_SMCIR to
replace sfence.vma.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>