A newly added function requires CONFIG_ACPI to avoid a build error:

sound/soc/amd/acp/acp-legacy-common.c: In function 'check_acp_pdm':
sound/soc/amd/acp/acp-legacy-common.c:401:19: error: implicit declaration of function 'acpi_find_child_device'; did you mean 'acpi_match_device'? [-Werror=implicit-function-declaration]
  401 |         pdm_dev = acpi_find_child_device(ACPI_COMPANION(&pci->dev), pdm_addr, 0);
      |                   ^~~~~~~~~~~~~~~~~~~~~~
      |                   acpi_match_device

The acp drivers really only work when ACPI is enabled already, so just
avoid the build failure with hard dependency in everything that
enables the acp-legacy-common portion.

Fixes: 3a94c8ad ("ASoC: amd: acp: add code for scanning acp pdm controller")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20231027152403.386257-1-arnd@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>