Add v17/leanback to pathmap.

Change-Id: I3032710da8cf8714516bf78f0971223257dfe1ec
diff --git a/core/pathmap.mk b/core/pathmap.mk
index faea2a8..bc5921d 100644
--- a/core/pathmap.mk
+++ b/core/pathmap.mk
@@ -110,7 +110,8 @@
         v7/mediarouter \
         v7/recyclerview \
         v8/renderscript \
-        v13
+        v13 \
+        v17/leanback
 
 #
 # A version of FRAMEWORKS_SUPPORT_SUBDIRS that is expanded to full paths from