Explicitly require root privs for tests requiring it

These tests currently require root privs to interact with netd:
  resolv_integration_test
  libnetdbpf_test
  netd_unit_test
  netd_integration_test

Bug: 134891412
Test: atest
Change-Id: I3e286fd7e7603e30b4f4d655fe311c35e05fbc78
diff --git a/libnetdbpf/Android.bp b/libnetdbpf/Android.bp
index bd25535..b5fefac 100644
--- a/libnetdbpf/Android.bp
+++ b/libnetdbpf/Android.bp
@@ -35,6 +35,7 @@
 cc_test {
     name: "libnetdbpf_test",
     test_suites: ["device-tests"],
+    require_root: true,
     srcs: [
         "BpfNetworkStatsTest.cpp",
     ],