vendor/cm: Introduce update-cm-prebuilts-latest-public-api.

Change-Id: I6a09d3b26573c81e74dc0338ef8899bebb1b5320
diff --git a/build/core/apicheck.mk b/build/core/apicheck.mk
index aa755f7..088adc4 100644
--- a/build/core/apicheck.mk
+++ b/build/core/apicheck.mk
@@ -116,4 +116,11 @@
 	@echo Copying cm_system-removed.txt
 	$(hide) $(ACP) $(INTERNAL_CM_PLATFORM_SYSTEM_REMOVED_API_FILE) $(FRAMEWORK_CM_PLATFORM_SYSTEM_REMOVED_API_FILE)
 
+.PHONY: update-cm-prebuilts-latest-public-api
+current_sdk_release_text_file := $(CM_SRC_API_DIR)/$(cm_last_released_sdk_version).txt
+
+update-cm-prebuilts-latest-public-api: $(FRAMEWORK_CM_PLATFORM_API_FILE) | $(ACP)
+	@echo -e ${CL_GRN}"Publishing cm_current.txt as latest API release"${CL_RST}
+	$(hide) $(ACP) $(FRAMEWORK_CM_PLATFORM_API_FILE) $(current_sdk_release_text_file)
+
 endif