tcp: move inet->rx_dst_ifindex to sk->sk_rx_dst_ifindex

tcp: move inet->rx_dst_ifindex to sk->sk_rx_dst_ifindex

[ Upstream commit 0c0a5ef809f9150e9229e7b13e43183b681b7a39 ]

Increase cache locality by moving rx_dst_ifindex next to sk->sk_rx_dst

This is part of an effort to reduce cache line misses in TCP fast path.

This removes one cache line miss in early demux.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>