Add recommendation suport library to build

Change-Id: Ica884fa2bae30979dd7d17b18a004459ad161da3
diff --git a/core/pathmap.mk b/core/pathmap.mk
index a32f4e7..87d3729 100644
--- a/core/pathmap.mk
+++ b/core/pathmap.mk
@@ -116,7 +116,8 @@
         v13 \
         v17/leanback \
         design \
-        percent
+        percent \
+        recommendation
 
 #
 # A list of all source roots under frameworks/multidex.