Add PRODUCT_IS_AUTOMOTIVE flag for auto targets

bug: 150475340
Test: local run for car_continuous_instrumentation_tests for coral_car
Change-Id: I7305cbd72f1f7aa0a4a5a228b4f5ea3670365bf2
diff --git a/car_product/build/car.mk b/car_product/build/car.mk
index 4a76b5c..f87c869 100644
--- a/car_product/build/car.mk
+++ b/car_product/build/car.mk
@@ -69,6 +69,8 @@
 PRODUCT_DEVICE := generic
 PRODUCT_NAME := generic_car_no_telephony
 
+PRODUCT_IS_AUTOMOTIVE := true
+
 PRODUCT_PROPERTY_OVERRIDES := \
     ro.config.ringtone=Girtab.ogg \
     ro.config.notification_sound=Tethys.ogg \