Add com.android.apex.cts.shim.v1_prebuilt to Pixel 2

updatable_apex.mk no longer installs
com.android.apex.cts.shim.v1_prebuilt.
It has to be installed manually.

Bug: 133217528
Test: check installed-files.txt to see if
/system/apex/com.android.apex.cts.shim.apex exists

Change-Id: I11378ea2973e142c00b3ed9a2d920da303626b57
diff --git a/device.mk b/device.mk
index 7c0fdfc..45516df 100755
--- a/device.mk
+++ b/device.mk
@@ -19,6 +19,7 @@
 
 # Enable updating of APEXes
 $(call inherit-product, $(SRC_TARGET_DIR)/product/updatable_apex.mk)
+PRODUCT_PACKAGES := com.android.apex.cts.shim.v1_prebuilt
 
 ifneq (,$(filter 27, $(PRODUCT_EXTRA_VNDK_VERSIONS)))
     _vndk_test := true