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