forked from Mirrors/opensbi

This patch implements the SBI HSM suspend function. Using this new SBI call, the S-mode software can put calling HART in platform specific suspend (i.e. low-power) state. For a successful retentive suspend, the SBI call will return without errors upon resuming whereas for a successful non-retentive suspend, the SBI call will resume from a user provided resume address. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>