Revert "vsock: each transport cycles only on its own sockets"

This reverts commit d9fe5909 which is
commit 8e6ed963 upstream.

If this needs to come back into an Android kernel, it should be redone
in an ABI-neutral way.

Fixes: d9fe5909 ("vsock: each transport cycles only on its own sockets")
Cc: Jiyong Park <jiyong@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: If67ee273bd40d160ed92f058a5e8c866126ea46a