[unification] Update label of ddk library.

Bug: 36548
Change-Id: I9f20a79bb75815a5e530382993b7844b1d65013e
diff --git a/BUILD.gn b/BUILD.gn
index f2fb7aa..6a9796d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -230,10 +230,10 @@
     "source/components/utilities/utxfmutex.c",
   ]
   deps = [
-    "//zircon/public/lib/ddk",
     "//zircon/public/lib/fbl",
     "//zircon/public/lib/zircon-internal",
     "//zircon/system/dev/lib/pci",
+    "//zircon/system/ulib/ddk",
   ]
   defines = [ "_ALL_SOURCE" ]
   if (acpica_debug_output) {