nrf/boards/microbit: Include modmicrobit.h in board_modules.h.
So that users of the board module can find the init function of the module
implicitly.
#ifndef MICROPY_INCLUDED_NRF_BOARD_MICROBIT_BOARD_MODULES_H
#define MICROPY_INCLUDED_NRF_BOARD_MICROBIT_BOARD_MODULES_H
+#include "modmicrobit.h"
+
extern const struct _mp_obj_module_t microbit_module;
#define BOARD_MODULES \
