net/spnic:Remove the code about little endian and big endian conversion

Ramaxel inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4P01N


CVE: NA

Remove the code of endian converting
since hardware converts endian automatically.

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