Remove BOARD_VNDK_VERSION usage from Kati

As of VNDK deprecation, BOARD_VNDK_VERSION should not be referenced
anymore. This change removes BOARD_VNDK_VERSION references and related
logics from Kati, so VNDK deprecation can be fully set without flag.

Bug: 330100430
Test: AOSP CF build succeeded
Change-Id: I9ea5f1236268b99eb731ebf48afd9e595d06ab1a
diff --git a/core/main.mk b/core/main.mk
index bc8adde..b798b49 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1222,8 +1222,7 @@
 # Returns modules included automatically as a result of certain BoardConfig
 # variables being set.
 define auto-included-modules
-  $(if $(and $(BOARD_VNDK_VERSION),$(filter true,$(KEEP_VNDK))),vndk_package) \
-  $(if $(filter true,$(KEEP_VNDK)),,llndk_in_system) \
+  llndk_in_system \
   $(if $(DEVICE_MANIFEST_FILE),vendor_manifest.xml) \
   $(if $(DEVICE_MANIFEST_SKUS),$(foreach sku, $(DEVICE_MANIFEST_SKUS),vendor_manifest_$(sku).xml)) \
   $(if $(ODM_MANIFEST_FILES),odm_manifest.xml) \