ASoC: dt-bindings: Fix patternProperties with fixed strings

The simple-audio-card and renesas,rsnd bindings used 'patternProperties'
with fixed strings to work-around a dtschema meta-schema limitation. This
is now fixed and the schemas can be fixed to use 'properties' instead.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20220311234802.417610-1-robh@kernel.org


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