watchdog: imx2_wdt: Improve dev_crit() message

watchdog: imx2_wdt: Improve dev_crit() message

After issuing a "poweroff" command the board goes through the
expected power-off sequence and turns it off completely:

systemd-shutdown[1]: Powering off.
imx2-wdt 30280000.watchdog: Device shutdown: Expect reboot!
reboot: Power down

The "Expect reboot!" message is misleading because in the
power-off case, no reboot is expected to happen at all.

Avoid the confusion by removing the "Expect reboot!" message.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230822135255.1013981-1-festevam@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>