ASoC: amd: Add support for enabling DMIC on acp6x via _DSD

Currently the acp6x machine driver requires a hardcoded list of systems
that physically have DMIC connected.

To avoid having to continually add to an evergrowing list of systems add
support for a _DSD that can advertise this.

OEMs can add this _DSD to their BIOS under the ACP device to automatically
add the device to this driver without requiring any driver modifications.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20220411134532.13538-3-mario.limonciello@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>