Jessica Clarke e28d8a5b26 riscv: Use SBI shutdown call to implement RB_POWEROFF
Currently we only call sbi_shutdown in cpu_reset, which means we reach
"Please press any key to reboot." even when RB_POWEROFF is set, and only
once the user presses a key do we then shutdown. Instead, register a
shutdown_final event handler and make an SBI shutdown call if
RB_POWEROFF is set.

Reviewed by:	br, jhb (mentor), kp
Approved by:	br, jhb (mentor), kp
Differential Revision:	https://reviews.freebsd.org/D25183
2020-06-08 17:57:21 +00:00
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