arm64: dts: rockchip: rename vbus-supply to phy-supply in rk3566-box-demo.dts

'vbus-supply' does not match any of the regexes in rk3566-box-demo.dts
in the usb2phy0_otg node, so rename vbus-supply to phy-supply.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/1889d8ee-e119-4a52-33a1-b990a41a137c@gmail.com


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