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

Android.bp

@@ -708,11 +708,9 @@ filegroup {
     name: "framework-services-net-module-wifi-shared-srcs",
     srcs: [
         "core/java/android/net/DhcpResults.java",
-        "core/java/android/net/shared/Inet4AddressUtils.java",
         "core/java/android/net/shared/InetAddressUtils.java",
         "core/java/android/net/util/IpUtils.java",
         "core/java/android/util/LocalLog.java",
-        "core/java/com/android/internal/util/Preconditions.java",
     ],
 }
 
@@ -1175,7 +1173,10 @@ java_library {
         "framework-annotations-lib",
         "unsupportedappusage",
     ],
-    visibility: ["//frameworks/base/wifi"],
+    visibility: [
+        "//frameworks/base/wifi",
+        "//frameworks/base/services/net",
+    ],
 }
 
 filegroup {