ASoC: SOF: topology: create component extended tokens

Add comp_ext_tokens which will be used to parse all extended tokens,
these tokens will be stored it to struct snd_sof_widget.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200904132744.1699575-4-kai.vehmanen@linux.intel.com


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