loader: log: early enable usb only if debug is active

c33: fix sketch upload without debug
others: remove usbd device already enabled warning

Author: pennam

loader/main.c

@@ -220,7 +220,9 @@ static int loader(const struct shell *sh) {
 	}
 #elif CONFIG_LOG
 #if !CONFIG_USB_DEVICE_INITIALIZE_AT_BOOT
-	usb_enable(NULL);
+	if (debug) {
+		usb_enable(NULL);
+	}
 #endif
 	for (int i = 0; i < log_backend_count_get(); i++) {
 		const struct log_backend *backend;