[nrf fromtree] samples: usb: clean up legacy USB CDC ACM console sample

Remove the configuration for the new USB device stack, as there is now a
separate sample that demonstrates how to use it with Kconfig option
CONFIG_CDC_ACM_SERIAL_INITIALIZE_AT_BOOT.

Signed-off-by: Johann Fischer <[email protected]>
(cherry picked from commit 5914131)
Signed-off-by: Tomasz Moń <[email protected]>

Author: jfischer-no

samples/subsys/usb/console/Kconfig

@@ -4,52 +4,22 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <sample_usbd.h>
-
 #include <zephyr/kernel.h>
 #include <zephyr/sys/printk.h>
 #include <zephyr/usb/usb_device.h>
-#include <zephyr/usb/usbd.h>
 #include <zephyr/drivers/uart.h>
 
 BUILD_ASSERT(DT_NODE_HAS_COMPAT(DT_CHOSEN(zephyr_console), zephyr_cdc_acm_uart),
 	     "Console device is not ACM CDC UART device");
 
-#if defined(CONFIG_USB_DEVICE_STACK_NEXT)
-static struct usbd_context *sample_usbd;
-
-static int enable_usb_device_next(void)
-{
-	int err;
-
-	sample_usbd = sample_usbd_init_device(NULL);
-	if (sample_usbd == NULL) {
-		return -ENODEV;
-	}
-
-	err = usbd_enable(sample_usbd);
-	if (err) {
-		return err;
-	}
-
-	return 0;
-}
-#endif /* defined(CONFIG_USB_DEVICE_STACK_NEXT) */
-
 int main(void)
 {
 	const struct device *const dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_console));
 	uint32_t dtr = 0;
 
-#if defined(CONFIG_USB_DEVICE_STACK_NEXT)
-	if (enable_usb_device_next()) {
-		return 0;
-	}
-#else
 	if (usb_enable(NULL)) {
 		return 0;
 	}
-#endif
 
 	/* Poll if the DTR flag was set */
 	while (!dtr) {