arm64: dts: rockchip: Add watchdog support for RK3588

Shreeya Patelrequested to merge
shreeya/rk3588-linux:rk3588-watchdog into rk3588

Add DT node for watchdog support in RK3588.

Signed-off-by: Shreeya Patel shreeya.patel@collabora.com

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