[nrf fromtree] usb: uac2: Adjust log level

The ECONNABORTED occurs on host stop and start.
Lowered the log level.

Signed-off-by: Kristoffer Skøien <kristoffer.skoien@nordicsemi.no>

(cherry picked from commit a03b6d5)
(cherry picked from commit 4e93329)

Author: koffes

subsys/usb/device_next/class/usbd_uac2.c

@@ -808,7 +808,7 @@ static int uac2_request(struct usbd_class_data *const c_data, struct net_buf *bu
 	bi = udc_get_buf_info(buf);
 	if (err) {
 		if (err == -ECONNABORTED) {
-			LOG_WRN("request ep 0x%02x, len %u cancelled",
+			LOG_INF("request ep 0x%02x, len %u cancelled",
 				bi->ep, buf->len);
 		} else {
 			LOG_ERR("request ep 0x%02x, len %u failed",