forked from Mirrors/opensbi

The SBI SRST extension has been accepted and merged in the latest SBI v0.3-draft specification. (Refer, https://github.com/riscv/riscv-sbi-doc) It allows to S-mode software to request system shutdown, cold reboot, and warm reboot. This patch implements SBI SRST extension as a replacement of the legacy sbi_shutdown() call of SBI v0.1 specification. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>