[bsp][stm32] delete main.c myself code, modify README.md,add blank line to SConscript

bsp/stm32/stm32l053-st-nucleo/README.md

@@ -1,4 +1,4 @@
-# NUCLEO-L053R8 开发板的 BSP 说明
+# NUCLEO-L053R8 开发板 BSP 说明
 
 ## 简介
 

bsp/stm32/stm32l053-st-nucleo/board/CubeMX_Config/Src/main.c

@@ -97,17 +97,13 @@ int main(void)
   MX_GPIO_Init();
   MX_USART2_UART_Init();
   /* USER CODE BEGIN 2 */
-  uint32_t hell0;
-hell0 = HAL_RCC_GetPCLK1Freq();
-//printf("hell0:%d",hell0);
+
   /* USER CODE END 2 */
 
   /* Infinite loop */
   /* USER CODE BEGIN WHILE */
   while (1)
   {
-	HAL_UART_Transmit(&huart2, "hello\r\n", strlen("hello\r\n"), 10);
-HAL_Delay(1000);
     /* USER CODE END WHILE */
 
   /* USER CODE BEGIN 3 */