[BSP][STM32][STM32F469-DISCO]fix build error with qspi

bsp/stm32/stm32f469-st-disco/board/SConscript

@@ -26,9 +26,6 @@ if GetDepend(['BSP_USING_TOUCH']):
     
 if GetDepend(['BSP_USING_SDCARD']):
     src += ['ports/drv_sdcard.c']
-    
-if GetDepend(['BSP_USING_QSPI']):
-    src += ['ports/drv_qspi_flash.c']
 
 path =  [cwd]
 path += [cwd + '/CubeMX_Config/Inc']