Fix the problem of stm32f746-st-nucleo that env cannot be configured with menuconfig

Author: Ouxiaolong

bsp/stm32/stm32f746-st-nucleo/board/Kconfig

@@ -242,7 +242,7 @@ menu "On-chip Peripheral Drivers"
                 int "USB PULL UP STATUS"
                 default 0
         endif
-    source "libraries/HAL_Drivers/Kconfig"
+    source "../libraries/HAL_Drivers/Kconfig"
 
 endmenu