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

This reverts commit 3c464db0 which is
commit b253a068 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