fix(risc-v, virt64, plic): use volatile rw for claim and complete#10668

Rbb666 merged 1 commit intoRT-Thread:masterRT-Thread/rt-thread:masterfrom

OpenXiangShan:fix-riscv-virt-plic-claim-volatileOpenXiangShan/rt-thread:fix-riscv-virt-plic-claim-volatileCopy head branch name to clipboard