sctp: move hlist_node and hashent out of sctp_ep_common

[ Upstream commit 3d3b2f57d4447e6e9f4096ad01d0e4129f7bc7e9 ]

Struct sctp_ep_common is included in both asoc and ep, but hlist_node
and hashent are only needed by ep after asoc_hashtable was dropped by
Commit b5eff712 ("sctp: drop the old assoc hashtable of sctp").

So it is better to move hlist_node and hashent from sctp_ep_common to
sctp_endpoint, and it saves some space for each asoc.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 9ab0faa7f9ff ("sctp: Fix null-ptr-deref in reuseport_add_sock().")
Signed-off-by: Sasha Levin <sashal@kernel.org>