SCSI: spfc: Update lb mode acquired solution

Ramaxel inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QLBP


CVE: NA

Changes:
1. Read lb mode from chip
2. Disable fake vf function
3. Remove unnecessary code

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