Add ro.vndk.version property

ro.vndk.version property is VNDK version in vendor partition.
It is set to the value of BOARD_VNDK_VERSION at build time.

Bug: 66072863
Test: build & run
Change-Id: Iecaede005474c4179a8135cf967e5b5b5ebcb881
diff --git a/core/Makefile b/core/Makefile
index 912bf88..9dbcf7a 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -136,6 +136,11 @@
 INSTALLED_VENDOR_DEFAULT_PROP_TARGET := $(TARGET_OUT_VENDOR)/default.prop
 ALL_DEFAULT_INSTALLED_MODULES += $(INSTALLED_VENDOR_DEFAULT_PROP_TARGET)
 
+ifdef BOARD_VNDK_VERSION
+FINAL_VENDOR_DEFAULT_PROPERTIES := ro.vndk.version=${BOARD_VNDK_VERSION}
+else
+FINAL_VENDOR_DEFAULT_PROPERTIES :=
+endif
 FINAL_VENDOR_DEFAULT_PROPERTIES += \
     $(call collapse-pairs, $(PRODUCT_DEFAULT_PROPERTY_OVERRIDES))
 FINAL_VENDOR_DEFAULT_PROPERTIES := $(call uniq-pairs-by-first-component, \