Add recycler view resources to Support7Demos.

Missed that in the earlier CL.

Change-Id: I6bd3eb24eb1506fa4dba57250141bf36fabe0286
diff --git a/samples/Support7Demos/Android.mk b/samples/Support7Demos/Android.mk
index cd6c308..9e7164d 100644
--- a/samples/Support7Demos/Android.mk
+++ b/samples/Support7Demos/Android.mk
@@ -35,11 +35,13 @@
         frameworks/support/v7/appcompat/res \
         frameworks/support/v7/gridlayout/res \
         frameworks/support/v7/mediarouter/res \
+        frameworks/support/v7/recyclerview/res \
         frameworks/support/v7/cardview/res
 LOCAL_AAPT_FLAGS := \
         --auto-add-overlay \
         --extra-packages android.support.v7.appcompat \
         --extra-packages android.support.v7.cardview \
         --extra-packages android.support.v7.gridlayout \
+        --extra-packages android.support.v7.recyclerview \
         --extra-packages android.support.v7.mediarouter
 include $(BUILD_PACKAGE)