ARM: dts: allwinner: orangepi-zero-plus2: Add default audio routing

ARM: dts: allwinner: orangepi-zero-plus2: Add default audio routing

The Orange Pi Zero Plus 2 has the same pinout[1] as the Orange Pi
Zero[2] (with the possible exception of line-out left/right being
swapped), and the Orange Pi Zero Interface Board is sold[3] as
compatible with both of them. We can thus use the same audio routing.

[1]: http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/details/Orange-Pi-Zero-Plus-2.html
[2]: https://linux-sunxi.org/Xunlong_Orange_Pi_Zero#Expansion_Port
[3]: https://orangepi.com/index.php?route=product/product&product_id=871

Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
Link: https://patch.msgid.link/20250911-opz-audio-v3-2-9dfd317a8163@posteo.net
Signed-off-by: Chen-Yu Tsai <wens@csie.org>