Add bpf support for NetworkStatsFactory

Add the native method used to read the detail information of network
stats from bpf maps. The native method of NetworkStatsFactory should
choose the correct implementation to get the stats detail depending on
the kernel version. Currently the bpf result is printed as a reference
and the actual behavior of NetworkStatsFactory should not change.

Test: NetworkStatsFactory related cts test should not fail.
Bug: 30950746
Change-Id: I4715a23559b5b2306bd556cea0431f0ed172a993
diff --git a/core/jni/Android.bp b/core/jni/Android.bp
index bc98716..b3fb43d 100644
--- a/core/jni/Android.bp
+++ b/core/jni/Android.bp
@@ -215,6 +215,8 @@
     ],
 
     shared_libs: [
+        "libbpf",
+        "libnetdutils",
         "libmemtrack",
         "libandroidfw",
         "libappfuse",