ASoC: dt-bindings: renesas: rsnd: correct comments syntax

yamllint expect space after '#' comment mark:

  renesas,rsnd.yaml:282:4: [error] missing starting space in comment (comments)

Fixes: 7f8b5b24 ("ASoC: dt-bindings: renesas,rsnd.yaml: add R-Car Gen4 support")
Reported-by: Rafał Miłecki <zajec5@gmail.com>
Link: https://lore.kernel.org/all/b2810924-169d-0bad-8f20-6ec2e683d170@gmail.com/


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230317082137.12629-1-krzysztof.kozlowski@linaro.org


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