ASoC: SOF: ops: add parse_platform_ext_manifest() op

ASoC: SOF: ops: add parse_platform_ext_manifest() op

Add parse_platform_ext_manifest() op to parse platform-specific config
data in the extended manifest.

Signed-off-by: Fred Oh <fred.oh@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20201127164022.2498406-2-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>