spraid: support Ramaxel raid controller

Ramaxel inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I494HF


CVE: NA

This initial commit contains Ramaxel's spraid module.
The spraid controller has two modes: HBA mode and raid mode. Raid mode
supports raid 0/1/5/6/10/50/60 mode.
The spraid driver works under scsi sub system and transfers scsi commands
to ramaxel raid chip.

Signed-off-by: Yanling Song <songyl@ramaxel.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>