[NETD-BPF#21] Move a few headers to frameworks/libs/net

BPF headers used by both platform and mainline modules should be in
frameworks/libs/net.

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1928066

Bug: 202086915
Test: build and boot
Test: cd packages/modules/Connectivity/netd; atest
Change-Id: I5a86ccd44a673a18138201f186b104f5214fd449
Merged-In: I5a86ccd44a673a18138201f186b104f5214fd449