Allow overriding PRODUCT_EXTRA_VNDK_VERSIONS

As a PRODUCT variable, PRODUCT_EXTRA_VNDK_VERSIONS is not allowed to
be assigned from the build command. Instead, we can use
OVERRIDE_PRODUCT_EXTRA_VNDK_VERSIONS in the build command to
override PRODUCT_EXTRA_VNDK_VERSIONS.

Bug: 132412510
Test: OVERRIDE_PRODUCT_EXTRA_VNDK_VERSIONS=28 m vndk_snapshot_package
Change-Id: I91579961ab393f40ddce8bfe9304829b5b669441
diff --git a/core/product_config.mk b/core/product_config.mk
index 5ba69a6..cb58cf4 100644
--- a/core/product_config.mk
+++ b/core/product_config.mk
@@ -384,6 +384,15 @@
   endif
 endif
 
+# If build command defines OVERRIDE_PRODUCT_EXTRA_VNDK_VERSIONS,
+# override PRODUCT_EXTRA_VNDK_VERSIONS with it.
+ifdef OVERRIDE_PRODUCT_EXTRA_VNDK_VERSIONS
+  PRODUCT_EXTRA_VNDK_VERSIONS := $(OVERRIDE_PRODUCT_EXTRA_VNDK_VERSIONS)
+endif
+
+$(KATI_obsolete_var OVERRIDE_PRODUCT_EXTRA_VNDK_VERSIONS \
+    ,Use PRODUCT_EXTRA_VNDK_VERSIONS instead)
+
 define product-overrides-config
 $$(foreach rule,$$(PRODUCT_$(1)_OVERRIDES),\
     $$(if $$(filter 2,$$(words $$(subst :,$$(space),$$(rule)))),,\