watchdog: update author email for at32ap700x_wdt

This patch updates the email address of the at32ap700x_wdt driver supported by
me to an email account I will use on a more regular basis in the future.

Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>