ASoC: dt-bindings: apple,mca: Add t6020-mca compatible

ASoC: dt-bindings: apple,mca: Add t6020-mca compatible

After discussion with the devicetree maintainers we agreed to not extend
lists with the generic compatible "apple,mca" anymore [1]. Use
"apple,t8103-mca" as base compatible as it is the SoC the driver and
bindings were written for.

mca on Apple's M2 Pro/Max/Ultra SoCs is compatible with
"apple,t8103-mca" so add its per-SoC compatible with the former as
fallbeck used by the existing driver.

[1]: https://lore.kernel.org/asahi/12ab93b7-1fc2-4ce0-926e-c8141cfe81bf@kernel.org/

Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Janne Grunau <j@jannau.net>