net:spnic: Add the get_rxfh_indir_size in ethtool_ops structure.

Ramaxel inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4J0GH


CVE: NA

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1.Solve the problem that the indirection table cannot be obtained
  by ethtool - x ethx command.
2.Solve the system oops problem caused by
  ethtool - x ethx default  command.

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