Seperate header target for DnsResolver from libnetd_client_header

0. Move NETID_USE_LOCAL_NAMESERVERS definition to DnsResolver
1. Create libnetdbinder_utils shared to DnsResolver
2. Use dnsproxyd_protocol_headers for NETID_USE_LOCAL_NAMESERVERS

Bug: 151895202
Test: build
Change-Id: I5315f5214bc7cd399e878b96a06f486dc8e4b874
diff --git a/Android.bp b/Android.bp
index 8942ff6..01a8e77 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,6 +1,11 @@
 cc_library_headers {
     name: "libnetd_client_headers",
     export_include_dirs: ["include"],
+}
+
+cc_library_headers {
+    name: "libnetdbinder_utils_headers",
+    export_include_dirs: ["include/binder_utils"],
     apex_available: [
         "//apex_available:platform",
         "com.android.resolv",