Fix the dependencies to make online-sdk-docs.

Without the framework library, 'make online-sdk-docs' can not find symbols
 in the framework library.
diff --git a/Android.mk b/Android.mk
index 2aa75f1..ff61e0d 100644
--- a/Android.mk
+++ b/Android.mk
@@ -333,6 +333,7 @@
 framework_docs_LOCAL_JAVA_LIBRARIES := \
 			core \
 			ext \
+			framework \
 
 framework_docs_LOCAL_MODULE_CLASS := JAVA_LIBRARIES
 framework_docs_LOCAL_DROIDDOC_HTML_DIR := docs/html