The acp-platform driver now needs the ACPI helpers:

ld.lld: error: undefined symbol: snd_soc_acpi_find_machine
>>> referenced by acp-platform.c
>>>               soc/amd/acp/acp-platform.o:(acp_machine_select) in archive sound/built-in.a

ld.lld: error: undefined symbol: snd_soc_acpi_codec_list
>>> referenced by acp-renoir.c
>>>               soc/amd/acp/acp-renoir.o:(snd_soc_acpi_amd_acp_machines) in archive sound/built-in.a

Other drivers using this interface, select SND_SOC_ACPI, so do the
same thing here.

Fixes: e646b51f ("ASoC: amd: acp: Add callback for machine driver on ACP")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20211029113714.966823-1-arnd@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>