forked from Mirrors/opensbi

The patch adds sbi_scratch_last_hartid() API which returns last HART id having a scratch space. We can use this new API to optimize places where we iterate over HART id from 0 to SBI_HARTMASK_MAX_BITS. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>