Revert "Suppress NewApi warnings for @SystemApi -> public APIs"

Revert "Add VpnServiceBuilderShim for VpnService.Builder"

Revert submission 1551943-vpn-impl

Reason for revert: <DroidMonitor-triggered revert due to breakage https://android-build.googleplex.com/builds/quarterdeck?branch=aosp-master&target=mainline_modules_x86_64-userdebug&lkgb=8007224&lkbb=8008168&fkbb=8007902 >, bug b/210979001
Reverted Changes:
I0e7aa077a:Add VpnServiceBuilderShim for VpnService.Builder
Ib12f5ab39:Suppress NewApi warnings for @SystemApi -> public ...
I59b9185cf:Unhide RouteInfo#getType and related fields
Ie5b62b2b2:Unhide IpPrefix(InetAddress, int)
I993a32d40:Add CTS tests for exclude VPN routes APIs
Ib24b2d3fb:Suppress NewApi warnings for @SystemApi -> public ...
Ic3b10464a:Add APIs that allow to exclude routes from VPN

Change-Id: I5b918dbf4293168c2a02cfe1c0f6ca8342b3195c
BUG: 210979001
diff --git a/staticlibs/client-libs/netd/com/android/net/module/util/NetdUtils.java b/staticlibs/client-libs/netd/com/android/net/module/util/NetdUtils.java
index de13d42..e78e336 100644
--- a/staticlibs/client-libs/netd/com/android/net/module/util/NetdUtils.java
+++ b/staticlibs/client-libs/netd/com/android/net/module/util/NetdUtils.java
@@ -23,7 +23,6 @@
 import static android.net.RouteInfo.RTN_UNREACHABLE;
 import static android.system.OsConstants.EBUSY;
 
-import android.annotation.SuppressLint;
 import android.net.INetd;
 import android.net.InterfaceConfigurationParcel;
 import android.net.IpPrefix;
@@ -214,7 +213,6 @@
         return failures;
     }
 
-    @SuppressLint("NewApi")
     private static String findNextHop(final RouteInfo route) {
         final String nextHop;
         switch (route.getType()) {