ASoC: SOF: ext_manifest: parse windows

The window description can be extracted from the extended manifest
content. This information known at build time does not need to be
provided in a mailbox.

Signed-off-by: Karol Trzcinski <karolx.trzcinski@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20200520165911.21696-5-kai.vehmanen@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>