[bsp][stm32]fix stm32f469 sdram not enable problem.

bsp/stm32/libraries/HAL_Drivers/drivers/drv_sdram.c

@@ -9,6 +9,7 @@
  */
 
 #include <board.h>
+#include <rtthread.h>
 
 #ifdef BSP_USING_SDRAM
 #include <sdram_port.h>