Revert "Move Inet[4]AddressUtils to libs/net"

This reverts commit cf86031c12405ddb5817cf834c49a032480547b3.

Reason for revert: Breaks the build b/160390899

Merged-In: Icd141a992c46290c74929785e261a1cd57bc001b
Change-Id: Ie10e66f61393602f17fbb61bf17230b176bf1f44
diff --git a/Tethering/src/android/net/dhcp/DhcpServingParamsParcelExt.java b/Tethering/src/android/net/dhcp/DhcpServingParamsParcelExt.java
index aaaec17..4710a30 100644
--- a/Tethering/src/android/net/dhcp/DhcpServingParamsParcelExt.java
+++ b/Tethering/src/android/net/dhcp/DhcpServingParamsParcelExt.java
@@ -16,7 +16,7 @@
 
 package android.net.dhcp;
 
-import static com.android.net.module.util.Inet4AddressUtils.inet4AddressToIntHTH;
+import static android.net.shared.Inet4AddressUtils.inet4AddressToIntHTH;
 
 import android.net.LinkAddress;
 import android.util.ArraySet;