Add documents-archive to SDK, docs builds

Bug: 28762753
Change-Id: I169adfb3124aac92cb3b96966667a2f8b4b78472
diff --git a/core/pathmap.mk b/core/pathmap.mk
index a10e671..d84465a 100644
--- a/core/pathmap.mk
+++ b/core/pathmap.mk
@@ -120,6 +120,7 @@
         v7/preference \
         v14/preference \
         v17/preference-leanback \
+        documents-archive \
         customtabs
 
 #