watchdog: armada_37xx_wdt: remove struct resource

No need for it with devm_platform_ioremap_resource. Simplifies probe
slightly.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20241003214508.121107-1-rosenp@gmail.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>