add droiddoc flag for honeycomb apis (for reference filtering)

Change-Id: I711b71cbb914cbe9b6bcf7feae55332b1f3fa1c1
diff --git a/Android.mk b/Android.mk
index 696b117..e0bd348 100644
--- a/Android.mk
+++ b/Android.mk
@@ -362,6 +362,7 @@
     -since ./frameworks/base/api/6.xml 6 \
     -since ./frameworks/base/api/7.xml 7 \
     -since ./frameworks/base/api/8.xml 8 \
+    -since ./frameworks/base/api/current.xml HC \
 		-error 1 -error 2 -warning 3 -error 4 -error 6 -error 8 \
 		-overview $(LOCAL_PATH)/core/java/overview.html