ASoC: dt-bindings: Add Loongson-1 AC97 Controller

Add devicetree binding document for Loongson-1 AC97 controller.

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
Link: https://patch.msgid.link/20250409-loongson1-ac97-v2-1-65d5db96a046@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>