[NETD-BPF#14] Move BPF map definition and utils to frameworks/libs/net/

Move BPF map definition and utilities to a common place that easy to be
referenced from both mainline module and platform code.

Bug: 202086915
Test: m; flash; boot
Test: cd system/netd/ && atest
Test: cd packages/modules/Connectivity && atest
Test: m gpuservice_unittest libtimeinstate_test bpf_module_test
      CtsAppOpsTestCases libbpf_load_test VtsBootconfigTest
      vts_test_binary_bpf_module bpf_benchmark libbpf_load_test
      libbpf_android_test
Change-Id: Ib15cf78c2da97bff835fb406c866676eec77c013
diff --git a/bpfloader/Android.bp b/bpfloader/Android.bp
index 7e7139f..c754e8d 100644
--- a/bpfloader/Android.bp
+++ b/bpfloader/Android.bp
@@ -39,6 +39,7 @@
         memtag_heap: true,
     },
     clang: true,
+    header_libs: ["bpf_map_utils"],
     shared_libs: [
         "libcutils",
         "libbpf_android",