Add mobile filter framework java library to core target files.

Change-Id: Ia4892d8c49be905ec68423224ca44c8558edbdb8
diff --git a/target/product/core.mk b/target/product/core.mk
index 6c8e21f..85a8514 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -39,6 +39,7 @@
     dmtracedump \
     dx \
     ext \
+    filterfw \
     framework-res \
     hprof-conv \
     icu.dat \