ANDROID: GKI: preserve ABI for struct sock_cgroup_data

In commit ad0f75e5f57c ("cgroup: fix cgroup_sk_alloc() for
sk_clone_lock()") the struct sock_cgroup_data fields are changed a bit,
in a way that keeps the same size and functionality, it just packs
another bit into the structure.

Because this does not really change the abi, tell the genksyms detector
that nothing has changed so that the ABI checker is happy.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ibc748616140ac0da69b04699cfd2322dc4e5d1f4