tools: replace DEFINE script to Makefile variable

In the past, predefined macros were generated by define.sh scripts
Now they are generated by concatenating environment variables

In this way, when executing makefile, no shell command will be executed,
it will improve the speed of executing makfile

Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>

drivers/syslog/Make.defs

@@ -38,7 +38,7 @@ ifeq ($(CONFIG_RAMLOG),y)
   CSRCS += ramlog.c
 
   ifneq ($(CONFIG_RAMLOG_BUFFER_SECTION),"")
-    CFLAGS += ${shell $(DEFINE) "$(CC)" RAMLOG_BUFFER_SECTION=CONFIG_RAMLOG_BUFFER_SECTION}
+    CFLAGS += ${DEFINE_PREFIX}RAMLOG_BUFFER_SECTION=CONFIG_RAMLOG_BUFFER_SECTION
   endif
 endif