dt-bindings: watchdog: airoha: Add support for Airoha AN7583 SoC

dt-bindings: watchdog: airoha: Add support for Airoha AN7583 SoC

Add compatible for Airoha AN7583 SoC. The implementation is exactly the
same of Airoha EN7581 hence we add the compatible in addition to EN7581
ones.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>