net: hns3: add ethtool_ops.set_channels support for HNS3 VF driver

This patch adds ethtool_ops.set_channels support for HNS3 VF driver,
and updates related TQP information and RSS information, to support
modification of VF TQP number, and uses current rss_size instead of
max_rss_size to initialize RSS.

Also, fixes a format error in hclgevf_get_rss().

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>