Revert "tcp: drop secpath at the same time as we currently drop dst"

This reverts commit cd34a07f which is
commit 9b6412e6 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I8921be76c0f97b5a60009e4521413f6d5409e0b9
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>