stm32/usb: Include py/mpconfig.h instead of mpconfigboard.h.

Because py/mpconfig.h has header include guards.

ports/stm32/usbd_desc.c

@@ -37,7 +37,7 @@
 #include "py/mphal.h"
 
 // need this header for any overrides to the below constants
-#include "mpconfigboard.h"
+#include "py/mpconfig.h"
 
 #ifndef USBD_LANGID_STRING
 #define USBD_LANGID_STRING            0x409

ports/stm32/usbdev/class/inc/usbd_cdc_msc_hid.h

@@ -7,8 +7,7 @@
 #include  "usbd_ioreq.h"
 
 // These are included to get direct access the MICROPY_HW_USB_xxx config
-#include "mpconfigboard.h"
-#include "mpconfigboard_common.h"
+#include "py/mpconfig.h"
 
 // Work out if we should support USB high-speed device mode
 #if MICROPY_HW_USB_HS \