ASoC: Intel: Fix baytrail-pcm-audio MODULE_ALIAS

I forgot to update this after changing the driver name.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
ASoC: Intel: Move DSP init/free from sst-acpi to platform code

Referencing platform specific DSP init/free functions creates two problem:
First it causes build error if particular platform support is not compiled
and it causes modprobe to load all of those modules.

Fix this by moving them to platform specific PCM modules.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>