Create folder for SystemUpdate sample app.

Test: no functional changes.

Change-Id: I2e8c654086ca49063c59ae0529e190323c84d6ad
diff --git a/Android.mk b/Android.mk
index 5dca32a..98d1f0c 100644
--- a/Android.mk
+++ b/Android.mk
@@ -276,6 +276,7 @@
 include \
     $(LOCAL_PATH)/boot_control/Android.mk \
     $(LOCAL_PATH)/minui/Android.mk \
+    $(LOCAL_PATH)/sample_updater/Android.mk \
     $(LOCAL_PATH)/tests/Android.mk \
     $(LOCAL_PATH)/tools/Android.mk \
     $(LOCAL_PATH)/updater/Android.mk \