stm32/mpconfigboard_common: Define TinyUSB MCU type for N6.

Allows using TinyUSB stack on N6.

Note there's still an issue with TinyUSB on the N6: `pyb_usbd_init()` can't
be called multiple times (on soft-reboot).

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>

Author: iabdalkader

ports/stm32/mpconfigboard_common.h

@@ -542,6 +542,9 @@
 #define MICROPY_HW_MAX_UART (10)
 #define MICROPY_HW_MAX_LPUART (1)
 
+#define CFG_TUSB_MCU OPT_MCU_STM32N6
+#define CFG_TUSB_RHPORT0_MODE (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
+
 // Configuration for STM32U5 series
 #elif defined(STM32U5)