ARM: dts: rockchip: add reset property for rk3066a-rayeager emac phy

The ethernet phy of rk3066a-rayeager has a reset pin, it controlled by
GPIO1_D6, this pin should be pull down then pull up to reset the phy.
Add a reset-gpios property in phy0, make the phy can be reset when emac
power on.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>