ASoC: audio-graph-card2: Use cleanup.h instead of devm_kfree()

Allocate the memory with scoped/cleanup.h, instead of devm interface, to
make the code more obvious that memory is not used outside this scope.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/20240703-asoc-cleanup-h-v1-7-71219dfd0aef@linaro.org


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