Add DCD for Dialog DA1469x MCU

Dialog Semiconductor's BLE MCU DA1469x comes with full speed USB.
It's base on National Semiconductor discrete USB controller USBN9603/4.

This adds support for:
- control/interrupt/bulk endpoints (up to 64 bytes)
- ISO endpoint were not tested and may not work correctly
- reset/sleep/wakeup are handled
- code for VBUS changes is provided

src/tusb_option.h

@@ -92,6 +92,9 @@
 // Espressif
 #define OPT_MCU_ESP32S2           900 ///< Espressif ESP32-S2
 
+// Dialog
+#define OPT_MCU_DA1469X          1000 ///< Dialog Semiconductor DA1469x
+
 /** @} */
 
 /** \defgroup group_supported_os Supported RTOS