Please review path about lib: sbi: Refine the settings for switching to Virtual Supervisor Mode.

[Pope B.Lei]

Dear All:
     I discovered a subtle bug during the process of switching to VS
mode. The issue arises because, even though Mstatus.MPV is set, before
executing mret, one should access the VS mode registers using their
actual addresses, rather than using the pseudonyms of the S registers.

Best Regards!

Boswell Lei
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