using new macro: RT_USING_CONSOLE to enable console in rtconfig.h

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1482 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/sam7x/rtconfig.h

@@ -61,6 +61,7 @@
 #define RT_UART_RX_BUFFER_SIZE	128
 
 /* SECTION: Console options */
+#define RT_USING_CONSOLE
 /* the buffer size of console*/
 #define RT_CONSOLEBUF_SIZE	128