arm64: dts: rockchip: Add gmac phy reset GPIO to QNAP TS433

While looking through the vendor U-Boot code Heiko spotted that a SoC
GPIO is connected to the ethernet phy's reset pin. Add the respective
reset-gpios property with pinmuxing for the GPIO to the phy node.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/49f66206fccc714a8745b9ac35247615ad5cc369.1742331667.git.ukleinek@kernel.org


Signed-off-by: Heiko Stuebner <heiko@sntech.de>