ASoC: amd: vangogh: use sizeof of variable instead of struct type

Use sizeof(*machine) instead of sizeof(struct acp5x_platform_info)

There is a possibility of bug when variable type has changed but
corresponding struct passed to the sizeof has not.

Signed-off-by: Lucas Tanure <lucas.tanure@collabora.com>
Link: https://lore.kernel.org/r/20230217110850.1045250-4-lucas.tanure@collabora.com


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