ASoC: dt-bindings: tas27xx: add compatible for SN012776

The TI SN012776 is a variant of TAS2764 found in Apple Silicon Macs.
It continues Apple's long-standing policy of getting vendors to
spin out subtly incompatible and Apple-exclusive variants of their
publicly available parts.

Reviewed-by: Neal Gompa <neal@gompa.dev>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
Link: https://patch.msgid.link/20250227-apple-codec-changes-v3-1-cbb130030acf@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>