firmware: fix spelling typo of 'wtih'

wtih -> with
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Wang Qing <wangqing@vivo.com>
Link: https://lore.kernel.org/r/1604737181-14464-1-git-send-email-wangqing@vivo.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/firmware/raspberrypi.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Defines interfaces for interacting wtih the Raspberry Pi firmware's
+ * Defines interfaces for interacting with the Raspberry Pi firmware's
  * property channel.
  *
  * Copyright © 2015 Broadcom