remove rt_hw_uart_init() function invoke in startup.c

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@471 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/stm32_radio/startup.c

@@ -106,8 +106,7 @@ void rtthread_startup(void)
 
     codec_hw_init();
 
-    /* init hardware serial device */
-    rt_hw_usart_init();
+    /* init hardware device */
 #ifdef RT_USING_DFS
     GPIO_ResetBits(GPIOC,GPIO_Pin_6);
     rt_hw_sdcard_init();