[PATCH v3 1/4] RISC-V: Update the CSR to privilege spec 1.12.

[Nelson Chu]

Hi Andrew and Jim,

Thanks for the feedback.  Yes the serial patches are according to the
Oct 14 draft, so it is the old one. I agree with that keep the draft
standard into the RISC-V github repo is more appropriate.  Therefore,
I will remove this patch in this term.

Thanks
Nelson