arm64: dts: rockchip: remove unused usb2 nodes for Lunzn Fastrhino R6xS

Fix the following error when booting:
[   15.851853] platform fd800000.usb: deferred probe pending
[   15.852384] platform fd840000.usb: deferred probe pending
[   15.852881] platform fd880000.usb: deferred probe pending

This is due to usb2phy1 is not enabled. There is no USB 2.0
port on the board, just remove it.

Fixes: c79dab40 ("arm64: dts: rockchip: Add Lunzn Fastrhino R66S")
Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Link: https://lore.kernel.org/r/20240630150010.55729-5-amadeus@jmu.edu.cn


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