Delete DhcpResults from frameworks/base.

This class is only used by NetworkStack, so move it to the
NetworkStack project.

Test: m
Change-Id: I356ee7b24613e84b8a90ddccd6d25d0742d13ae7

core/java/Android.bp

@@ -144,7 +144,6 @@ java_library {
 filegroup {
     name: "framework-services-net-module-wifi-shared-srcs",
     srcs: [
-        "android/net/DhcpResults.java",
         "android/util/LocalLog.java",
     ],
 }