Install data_libs using relative_install_path property

Test: Added to data_libs tests
Test: Manually verified with bionic-unit-tests
Test: Treehugger
Change-Id: I28a8e08e3409f1e7c7bb72f4351310b57f35f513
diff --git a/apex/apex.go b/apex/apex.go
index b29017d..aa0f906 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -1145,7 +1145,7 @@
 	module     android.Module
 	// list of symlinks that will be created in installDir that point to this apexFile
 	symlinks      []string
-	dataPaths     android.Paths
+	dataPaths     []android.DataPath
 	transitiveDep bool
 	moduleDir     string