Define PLATFORM_VNDK_VERSION

PLATFORM_VNDK_VERSION means the VNDK version that current build
provides. This value will be set to PLATFORM_SDK_VERSION once the
version is release. Otherwise, it will be set to "current".

Bug: 69883025
Test: device boot
Change-Id: I3fde4943aa062d9d148a3d7fc2798948870a48c6
diff --git a/core/envsetup.mk b/core/envsetup.mk
index e220fae..89a39a8 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -292,7 +292,7 @@
 
 ifdef BOARD_VNDK_VERSION
   ifneq ($(BOARD_VNDK_VERSION),current)
-    $(call check_vndk_version,$(BOARD_VNDK_VERSION))
+    $(error BOARD_VNDK_VERSION: Only "current" is implemented)
   endif
 
   TARGET_VENDOR_TEST_SUFFIX := /vendor