Update slave.mk

fix SONIC_ENABLE_KDUMP

slave.mk

@@ -642,7 +642,7 @@ $(addprefix $(TARGET_PATH)/, $(SONIC_INSTALLERS)) : $(TARGET_PATH)/% : \
 	export platform_common_py2_wheel_path="$(addprefix $(PYTHON_WHEELS_PATH)/,$(SONIC_PLATFORM_COMMON_PY2))"
 	export redis_dump_load_py2_wheel_path="$(addprefix $(PYTHON_WHEELS_PATH)/,$(REDIS_DUMP_LOAD_PY2))"
 	export install_debug_image="$(INSTALL_DEBUG_TOOLS)"
-	export sonic_kdump_enable="$(SONIC_KDUMP_ENABLE)"
+	export sonic_kdump_enable="$(SONIC_ENABLE_KDUMP)"
 
 	$(foreach docker, $($*_DOCKERS),\
 		export docker_image="$(docker)"