forked from Mirrors/opensbi

tlb_process_count is only used when count=1, so refactor to tlb_process_once and add the return value to be reused in tlb_process Signed-off-by: Xiang W <wxjstz@126.com> Reviewed-by: Anup Patel <anup@brainfault.org> Tested-by: Anup Patel <anup@brainfault.org>