ipv4: Link IPv4 address to per-netns hash table.

As a prep for per-netns RTNL conversion, we want to namespacify
the IPv4 address hash table and the GC work.

Let's allocate the per-netns IPv4 address hash table to
net->ipv4.inet_addr_lst and link IPv4 addresses into it.

The actual users will be converted later.

Note that the IPv6 address hash table is already namespacified.

Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20241008172906.1326-2-kuniyu@amazon.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>