dmesg on QEMU

[MOCHIDA Shuji <mochid%netside.co.jp@localhost>]

Hi,

  http://mail-index.netbsd.org/source-changes/2023/05/07/msg144431.html

> Committed By:   skrll

> Log Message:
> RISC-V support that works on QEMU with a single hart.
> 
> Thanks for Simon Burge for plic(4).

 kernel booted on qemu-system-risc64:

  https://dmesgd.nycbug.org/index.cgi?do=view&id=7138

..Greate!!!

-mochid