Add device tree binding documentation for Everest ES8326 ---- v5 tested by dtschema Signed-off-by: David Yang <yangxiaohua@everest-semi.com> Signed-off-by: Zhu Ning <zhuning@everest-semi.com> Link: https://lore.kernel.org/r/20220816024456.4475-1-zhuning0077@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org>