Support NAT-T keepalive packet filter

Add NAT-T keepalive packet filter for dropping
NAT-T keepalive packet in APF filter.

Bug: 33530442
Test: atest FrameworksNetTests

Change-Id: I5191f0fdf1f754da556063ac6f7f6c84d0535910
Merged-In: I6e7fc58680c1687d251a4073b74f32ca0dc9918f
Merged-In: Ifbc157726c882504644180abb643c8725e019b3d
1 file changed