Use RELEASE_BOARD_API_LEVEL_FROZEN

RELEASE_BOARD_API_LEVEL_FROZEN must not be overriden by a board
config value. Use RELEASE_BOARD_API_LEVEL_FROZEN directly to build
configs.

Bug: 295269182
Test: TH
Change-Id: I60ad4cf1a9f377619fef98d6f9ef4d04d3395991
diff --git a/core/main.mk b/core/main.mk
index 649c75c..f5dbad8 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -311,10 +311,10 @@
 ADDITIONAL_VENDOR_PROPERTIES += \
     ro.board.api_level=$(BOARD_API_LEVEL)
 endif
-# BOARD_API_LEVEL_FROZEN is true when the vendor API surface is frozen.
-ifdef BOARD_API_LEVEL_FROZEN
+# RELEASE_BOARD_API_LEVEL_FROZEN is true when the vendor API surface is frozen.
+ifdef RELEASE_BOARD_API_LEVEL_FROZEN
 ADDITIONAL_VENDOR_PROPERTIES += \
-    ro.board.api_frozen=$(BOARD_API_LEVEL_FROZEN)
+    ro.board.api_frozen=$(RELEASE_BOARD_API_LEVEL_FROZEN)
 endif
 
 # Set build prop. This prop is read by ota_from_target_files when generating OTA,