ASoC: SOF: Move the definition of enum snd_sof_fw_state to global header

ASoC: SOF: Move the definition of enum snd_sof_fw_state to global header

Move the enum snd_sof_fw_state to include/sound/sof.h to be accessible
outside of the core SOF stack.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Paul Olaru <paul.olaru@oss.nxp.com>
Link: https://lore.kernel.org/r/20211223113628.18582-10-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>