Add PLATFORM_VERSION_LAST_STABLE to soong config

Bug: 189164487
Test: build
Change-Id: Iec36d22af80225f6da848bae1e02d263ff957df8
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 32675f2..d03b687 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -33,6 +33,7 @@
 $(call add_json_str,  Platform_security_patch,           $(PLATFORM_SECURITY_PATCH))
 $(call add_json_str,  Platform_preview_sdk_version,      $(PLATFORM_PREVIEW_SDK_VERSION))
 $(call add_json_str,  Platform_base_os,                  $(PLATFORM_BASE_OS))
+$(call add_json_str,  Platform_version_last_stable,      $(PLATFORM_VERSION_LAST_STABLE))
 
 $(call add_json_str,  Platform_min_supported_target_sdk_version, $(PLATFORM_MIN_SUPPORTED_TARGET_SDK_VERSION))