arm64: dts: mt8195: Disable watchdog external reset signal

arm64: dts: mt8195: Disable watchdog external reset signal

Disable the external output reset signal of watchdog reset to avoid losing
the reset reason stored in the watchdog registers.

Signed-off-by: Fengquan Chen <fengquan.chen@mediatek.com>
Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220811025813.21492-9-tinghan.shen@mediatek.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>