K 10
svn:author
V 6
jrtc27
K 8
svn:date
V 27
2020-06-08T17:57:21.853503Z
K 7
svn:log
V 477
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

END