riscv: Fix privileged trap controls#29
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This PR fixes RISC-V privileged trap control behavior in tlib.
It allows mstatus.TVM, TW, and TSR to be written when S-mode is supported, fixes their bit definitions, and makes SFENCE.VMA trap when executed from U-mode or when TVM blocks it in S-mode.
Related to renode/renode#908
Related to renode/renode#926