Add workaround for Kotlin 1.4 upgrade am: 314fb889a1 am: 237e5097e4

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1411868

Change-Id: Ia57ca884efd2e05cd36d617c0d0d6cd44daeb2e4
diff --git a/staticlibs/Android.bp b/staticlibs/Android.bp
index f4799f0..1143e05 100644
--- a/staticlibs/Android.bp
+++ b/staticlibs/Android.bp
@@ -102,6 +102,9 @@
         "net-tests-utils-host-device-common",
         "net-utils-device-common",
     ],
+    kotlincflags: [
+        "-XXLanguage:-GenerateJvmOverloadsAsFinal"
+    ]
 }
 
 filegroup {