camera2: Fix makefile for ITS in CTS build (take 2).

Bug: 18056640
Change-Id: Ib498e3465613437c00bcd8369c2ee4bd207d9ef1
diff --git a/apps/CameraITS/Android.mk b/apps/CameraITS/Android.mk
index f0bbd8f..8f7ed7c 100644
--- a/apps/CameraITS/Android.mk
+++ b/apps/CameraITS/Android.mk
@@ -21,6 +21,8 @@
 
 .PHONY: camera-its
 
+$(its-dir): $(its-build-stamp)
+
 $(its-build-stamp): $(ACP)
 	echo $(its_dir)
 	mkdir -p $(its-dir)