ASoC: soc-acpi: move link_slaves_found()

ASoC: soc-acpi: move link_slaves_found()

Move existing function in common library to make sure the code can be
reused by other SoC vendors.

No functionality change outside of the move and added prefix.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230731213242.434594-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>