Enable strict_updatability_linting in frameworks/libs/net

Enable the strict_updatability_linting here first as a prior
commit to enable strict_updatability_linting in connectivity
modules.

Bug: 188851968
Test: m lint-check ; atest NetworkStaticLibTests
Change-Id: Idac98a1c85bf5bb86269b1daad2b444cfb58db8a
diff --git a/staticlibs/testutils/Android.bp b/staticlibs/testutils/Android.bp
index 9fd30f7..2f0bcc3 100644
--- a/staticlibs/testutils/Android.bp
+++ b/staticlibs/testutils/Android.bp
@@ -38,6 +38,7 @@
         "net-utils-device-common-netlink",
         "modules-utils-build_system",
     ],
+    lint: { strict_updatability_linting: true },
 }
 
 java_library {
@@ -59,7 +60,8 @@
   ],
   static_libs: [
       "kotlin-test"
-  ]
+  ],
+  lint: { strict_updatability_linting: true },
 }
 
 java_test_host {