ipv6: switch inet6_acaddr_hash() to less predictable hash

ipv6: switch inet6_acaddr_hash() to less predictable hash

commit 2384d02520ff ("net/ipv6: Add anycast addresses to a global hashtable")
added inet6_acaddr_hash(), using ipv6_addr_hash() and net_hash_mix()
to get hash spreading for typical users.

However ipv6_addr_hash() is highly predictable and a malicious user
could abuse a specific hash bucket.

Switch to __ipv6_addr_jhash(). We could use a dedicated
secret, or reuse net_hash_mix() as I did in this patch.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20241008121307.800040-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>