Add missing platform_device_unregister() in error path in acp_pci_probe().

Fixes: c49f5e74 ("ASoC: amd: acp: Add error handling cases")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220819073758.1273160-1-yangyingliang@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>