Delete DhcpResults from frameworks/base.

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

Test: m
Change-Id: I356ee7b24613e84b8a90ddccd6d25d0742d13ae7
Merged-In: I356ee7b24613e84b8a90ddccd6d25d0742d13ae7

Android.bp

@@ -409,7 +409,6 @@ filegroup {
         // TODO: remove these annotations as soon as we can use andoid.support.annotations.*
         ":framework-annotations",
         ":modules-utils-preconditions-srcs",
-        "core/java/android/net/DhcpResults.java",
         "core/java/android/util/IndentingPrintWriter.java",
         "core/java/android/util/LocalLog.java",
         "core/java/com/android/internal/util/HexDump.java",