Revert "tcp: ensure to use the most recently sent skb when filling the rate sample"

This reverts commit 2cba6355 which is
commit b253a0680ceadc5d7b4acca7aa2d870326cad8ad upstream.

It breaks the abi and is not needed for Android systems, so revert it.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I6c40e8900bcc80b03e3d5fb2c99c9e95615b81ff