framework-wifi: remove duplicate classes

Preconditions & Inet4AddressUtils are statically
linked into both framework-wifi and service-wifi.
This creates duplicate classes, which should be
avoided. Instead, service-wifi should simply refer
to the copy of Preconditions/Inet4AddressUtils in
framework-wifi.

Bug: 153596226
Test: device boots up and connects to wifi
Change-Id: Ie78e5cf0f6ff7bc8a2fa8d7264b742f912601143
diff --git a/services/net/Android.bp b/services/net/Android.bp
index 9f29799..bb5409b 100644
--- a/services/net/Android.bp
+++ b/services/net/Android.bp
@@ -41,6 +41,7 @@
     sdk_version: "module_current",
     libs: [
         "unsupportedappusage",
+        "framework-wifi-util-lib",
     ],
     static_libs: [
         "dnsresolver_aidl_interface-V2-java",