Move NetworkUtils used by NetworkStack

Depending on usage move into NetworkStackUtils or shared
Inet4AddressUtils.

Test: atest FrameworksNetTests NetworkStackTests
Bug: 112869080
(Cherry-pick of aosp/881952)
Change-Id: Ie20dcee375b377236004a7689890729493aca857
diff --git a/packages/NetworkStack/Android.bp b/packages/NetworkStack/Android.bp
index a2da0a0..9b0d896 100644
--- a/packages/NetworkStack/Android.bp
+++ b/packages/NetworkStack/Android.bp
@@ -21,6 +21,7 @@
     installable: true,
     srcs: [
         "src/**/*.java",
+        ":framework-networkstack-shared-srcs",
         ":services-networkstack-shared-srcs",
     ],
     static_libs: [