stm32: fix include path

Author: amirgon

driver/stm32/STM32F7DISC/modrk043fn48h.c

@@ -1,6 +1,6 @@
 #include "py/runtime.h"
 #include "py/mphal.h"
-#include "softtimer.h"
+#include "shared/runtime/softtimer.h"
 #include <stdint.h>
 #include <stdbool.h>
 #include "../../../lvgl/lvgl.h"