switch to classic bpf macros

Note: this switches
  com_android_networkstack_tethering_util_setupIcmpFilter
over to relative cbpf which in turn is called from:
  com_android_networkstack_tethering_util_setupNaSocket
  com_android_networkstack_tethering_util_setupNsSocket
and tested by p/m/C's:
  TetheringUtilsTest.java - testIcmpSocketFilters()

Test: TreeHugger, atest TetheringUtilsTest
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I22a5ea8f8e3b879a37fe4acd84f61020661eaa71
3 files changed