dm: usb: Rename the XHCI HCD to U-Boot

This should be "U-Boot", not "u-boot".
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NMarek Vasut <marex@denx.de>

drivers/usb/host/xhci.c

@@ -704,7 +704,7 @@ static int xhci_submit_root(struct usb_device *udev, unsigned long pipe,
 				srclen = 4;
 				break;
 			case 1:	/* Vendor String  */
-				srcptr = "\16\3u\0-\0b\0o\0o\0t\0";
+				srcptr = "\16\3U\0-\0B\0o\0o\0t\0";
 				srclen = 14;
 				break;
 			case 2:	/* Product Name */