gptfdisk: Make libsgdisk visible to libvolume_manager

Change-Id: I7a91d8d7cefec304746c86557ae60d28362d231c
diff --git a/Android.bp b/Android.bp
index 99a446a..e06b2d7 100644
--- a/Android.bp
+++ b/Android.bp
@@ -117,4 +117,5 @@
 
     shared_libs: ["libext2_uuid"],
     static_libs: ["libgptf"],
+    visibility: ["//bootable/recovery/volume_manager"],
 }