net: hns3: get rss_size_max from configuration but not hardcode

net: hns3: get rss_size_max from configuration but not hardcode

BugLink: http://bugs.launchpad.net/bugs/1756097
Add configuration for rss_size_max in hdev but not hardcode it.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Mingguang Qu <qumingguang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 0e7a40cdac0a2aa7c6946a571b8428b3307bed85)
Signed-off-by: Manoj Iyer <manoj.iyer@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>