spl: opensbi: convert scratch options to config

Convert hardcoded "opensbi_info.options" to config provided value, this
allows changing options passed to OpenSBI.

SPL_OPENSBI_SCRATCH_OPTIONS is defaulted to SBI_SCRATCH_NO_BOOT_PRINTS.

Link: https://github.com/riscv-software-src/opensbi/blob/master/docs/firmware/fw_dynamic.md


Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>