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Make use of generic warm-boot path when platform hart_stop callback returns SBI_ENOTSUPP, in case certain hart can not turn off its power domain, or it detects some error occured in power management unit, it can fall through warm-boot flow and wait for interrupt in sbi_hsm_hart_wait(). Also improves comment in sbi_hsm_hart_wait(). Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Atish Patra <atishp@rivosinc.com> Reviewed-by: Anup Patel <anup@brainfault.org>