Backport ezsound-6x8 support to 6.6.y #6736
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Initially, I thought that the card (which has ADC and DAC clock pins connected to the Pi's I2S clock pin) would require support for DAI links with multiple codecs, and therefore would only work in 6.12.y. However, due to complex reasons (see #6564), the card is configured with 2 separate 1:1 DAI links and can work fine in 6.6.y. This PR brings the PCM3168A driver customisations and the card's DT overlay into the 6.6.y tree.