[IrDA]: Delay needed when uploading firmware chunks

With 42101001.sb firmwares, we need a 10 ms delay between firmware chunks
upload on irda-usb.

Patch from Nigel Williams <nigelw@elder-gods.net>
Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/irda/irda-usb.c

@@ -1057,6 +1057,8 @@ static int stir421x_fw_upload(struct irda_usb_cb *self,
 
 		if (ret < 0)
 			break;
+
+		mdelay(10);
 	}
 
 	kfree(patch_block);