make bpf_headers visible to libclat

Needed because ClatdController and clatd binary are moved
into apex. libclat is used for accessing BPF map.

Bug: 212345928
Test: manual test
    1. Connect to ipv6-only wifi.
    2. Try IPv4 traffic.
       $ ping 8.8.8.8
Change-Id: If3fb00e12ef365ccf3ac782c4e6ecbfd01d2dd4c
1 file changed
tree: 4233b201a2b4a1927a836c67195401a693e0ff12
  1. staticlibs/