Add packages to support OPEN/CREATE_DOC.

Change-Id: Id9314b2ed03d6ce7cc98c051a7654c225b393954
diff --git a/target/product/core.mk b/target/product/core.mk
index 56ee946..b321efd 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -29,6 +29,8 @@
     Contacts \
     ContactsProvider \
     DefaultContainerService \
+    DocumentsUI \
+    ExternalStorageProvider \
     Home \
     KeyChain \
     PicoTts \