watchdog: imx2_wdt: update contact email

The 'pengutronix' address is defunct for years. Use the proper contact
address.

Signed-off-by: Wolfram Sang <wsa@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200502142653.19144-1-wsa@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/imx2_wdt.c

@@ -2,7 +2,7 @@
 /*
  * Watchdog driver for IMX2 and later processors
  *
- *  Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. <w.sang@pengutronix.de>
+ *  Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. <kernel@pengutronix.de>
  *  Copyright (C) 2014 Freescale Semiconductor, Inc.
  *
  * some parts adapted by similar drivers from Darius Augulis and Vladimir