arm64: dts: allwinner: h6: orangepi: Disable OTG mode

As can be seen from OrangePi Lite 2 and One Plus schematics, VBUS pin on
USB OTG port is directly connected to 5 V power supply. This mean that
OTG port can safely operate only in host mode, even though these two
boards have ID pin connected.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>