forked from Mirrors/opensbi

Extend HART feature detection to discover Smstateen CSRs at boot-time and configure mstateen envcfg bit depending on availability of menvcfg CSR. Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com> Reviewed-by: Xiang W <wxjstz@126.com> Reviewed-by: Anup Patel <anup@brainfault.org>