Add missing target-native-copy-pairs util

The function was in test/framework/build/utils/vtslab_package_utils.mk
It was removed as part of the cleanup of vts10.
Function target-native-copy-pairs is still used to package kernel native
tests.

Bug: 170339160
Test: m vts
Change-Id: I0097022f05fc9adc47a664c63a8341040b4af106
diff --git a/core/tasks/vts-core-tests.mk b/core/tasks/vts-core-tests.mk
index a3247da..95c4d24 100644
--- a/core/tasks/vts-core-tests.mk
+++ b/core/tasks/vts-core-tests.mk
@@ -15,6 +15,8 @@
 -include external/linux-kselftest/android/kselftest_test_list.mk
 -include external/ltp/android/ltp_package_list.mk
 
+include $(BUILD_SYSTEM)/tasks/tools/vts_package_utils.mk
+
 test_suite_name := vts
 test_suite_tradefed := vts-tradefed
 test_suite_readme := test/vts/tools/vts-core-tradefed/README