arm64: dts: renesas: rzv2mevk2: Enable watchdog

Enable the watchdog so that we can reboot the system.

Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
Link: https://lore.kernel.org/r/20221103223956.50575-4-fabrizio.castro.jz@renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>