Fixed missing separator issue

Bug: 27486470
Change-Id: I40435531deb3f5bd77542c2ac12d8734e2e22d29
diff --git a/car_product/build/car.mk b/car_product/build/car.mk
index 3a7cfb1..1ee87e3 100644
--- a/car_product/build/car.mk
+++ b/car_product/build/car.mk
@@ -32,7 +32,7 @@
     screenrecord
 
 # This is for testing
-PRODUCT_PACKAGES +=
+PRODUCT_PACKAGES += \
     EmbeddedKitchenSinkApp
 
 PRODUCT_COPY_FILES := \