Replace Maps with a placeholder in the emulator.

We don't ship Google Maps with aosp, put in a placeholder
so the emulator doesn't look broken.

Bug: 32118797
Test: Manual.
Change-Id: I9b825d16d94316cc7af4966fc399bcbac2b321b6
diff --git a/car_product/build/car.mk b/car_product/build/car.mk
index 97549ae..8120f3e 100644
--- a/car_product/build/car.mk
+++ b/car_product/build/car.mk
@@ -90,6 +90,7 @@
     CarMediaApp \
     Stream \
     CarHvacApp \
+    CarMapsPlaceholder \
     android.car \
     libvehiclenetwork-native \
     vns_policy.xml \