ANDROID: update abi_gki_aarch64.xml for nf change

Leaf changes summary: 1 artifact changed
Changed leaf types summary: 0 leaf type changed
Removed/Changed/Added functions summary: 0 Removed, 0 Changed, 1 Added function
Removed/Changed/Added variables summary: 0 Removed, 0 Changed, 0 Added variable

1 Added function:

  [A] 'function unsigned int nf_nat_ipv4_fn(void*, sk_buff*, const nf_hook_state*)'

Change-Id: I08b46ffaf630e160cd29a37e6118ebd600a3a760
Signed-off-by: Alistair Delva <adelva@google.com>