ASoC: dt-bindings: nxp,tfa989x: Add tfa9890 support

Document TFA9890 binding for tfa989x.

Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>
Reviewed-by: Stephan Gerhold <stephan@gerhold.net>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220602164504.261361-2-amartinz@shiftphones.com


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