samples: hci_uart: use new USB device stack

The change only affects board nrf52840dongle_nrf52840.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>

Author: jfischer-no

samples/bluetooth/hci_uart/boards/nrf52840dongle_nrf52840.conf

@@ -1,4 +1,3 @@
-CONFIG_USB_DEVICE_STACK=y
-CONFIG_USB_DEVICE_PRODUCT="Zephyr HCI UART sample"
-CONFIG_USB_CDC_ACM=y
-CONFIG_USB_DEVICE_INITIALIZE_AT_BOOT=n
+# The board uses the CDC ACM UART as the serial backend by default, nothing
+# else needs to be configured here.
+CONFIG_CDC_ACM_SERIAL_PRODUCT_STRING="Zephyr HCI UART sample"

samples/bluetooth/hci_uart/src/main.c

@@ -20,8 +20,6 @@
 #include <zephyr/init.h>
 #include <zephyr/drivers/uart.h>
 
-#include <zephyr/usb/usb_device.h>
-
 #include <zephyr/net_buf.h>
 #include <zephyr/bluetooth/bluetooth.h>
 #include <zephyr/bluetooth/l2cap.h>
@@ -332,13 +330,6 @@ static int hci_uart_init(void)
 {
 	LOG_DBG("");
 
-	if (IS_ENABLED(CONFIG_USB_CDC_ACM)) {
-		if (usb_enable(NULL)) {
-			LOG_ERR("Failed to enable USB");
-			return -EINVAL;
-		}
-	}
-
 	if (!device_is_ready(hci_uart_dev)) {
 		LOG_ERR("HCI UART %s is not ready", hci_uart_dev->name);
 		return -EINVAL;