samples: hci_uart_3wire: remove USB related code

There is no advantage to using the USB CDC ACM UART in this sample.

Signed-off-by: Johann Fischer <[email protected]>

Author: jfischer-no

samples/bluetooth/hci_uart_3wire/README.rst

@@ -146,11 +146,6 @@ You can use following targets:
 Check the :zephyr:code-sample:`ble_direction_finding_connectionless_rx` and the
 :zephyr:code-sample:`ble_direction_finding_connectionless_tx` for more details.
 
-Using a USB CDC ACM UART
-========================
-
-The sample can be configured to use a USB UART instead. See :zephyr_file:`samples/bluetooth/hci_uart_3wire/boards/nrf52840dongle_nrf52840.conf`.
-
 Using the controller with the Zephyr host
 =========================================
 

samples/bluetooth/hci_uart_3wire/boards/nrf52840dongle_nrf52840.conf

@@ -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>
@@ -751,13 +749,6 @@ 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(h5_dev)) {
 		LOG_ERR("HCI UART %s is not ready", h5_dev->name);
 		return -EINVAL;