tiny android: include su

Change-Id: Ib8162c0f8171114ffafcac48d482fd3acd5d5956
diff --git a/core/main.mk b/core/main.mk
index 4a530d0..c6475ab 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -456,6 +456,7 @@
 	bionic \
 	system/core \
 	system/extras/ext4_utils \
+	system/extras/su \
 	build/libs \
 	build/target \
 	build/tools/acp \