axolotl-shiftos: Enforce product interfaces

Add 'PRODUCT_PRODUCT_VNDK_VERSION := current' and
'PRODUCT_ENFORCE_PRODUCT_PARTITION_INTERFACE := true' to enforce
product interfaces

Change-Id: I25436ecc8b4f2e90ed54b46fd976c66d897348db
diff --git a/axolotl.mk b/axolotl.mk
index 0c950b3..cebafa3 100644
--- a/axolotl.mk
+++ b/axolotl.mk
@@ -17,6 +17,14 @@
 
 PRODUCT_ENFORCE_ARTIFACT_PATH_REQUIREMENTS := true
 
+# Enforce native interfaces of product partition as VNDK
+PRODUCT_PRODUCT_VNDK_VERSION := current
+
+# Enforce java interfaces of product partition
+PRODUCT_ENFORCE_PRODUCT_PARTITION_INTERFACE := true
+
+#############################################################
+
 # APEX
 PRODUCT_COMPRESSED_APEX := true
 MAINLINE_COMPRESS_APEX_ALL := $(PRODUCT_COMPRESSED_APEX)