ASoC: SOF: Add a route_free op in struct sof_ipc_tplg_ops

IPC4 requires that the widgets be unbound in the firmware before they
are freed. So add a new op in struct sof_ipc_tplg_ops that will be used
to send the IPC to the firmware to unbind widgets.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220426171743.171061-7-ranjani.sridharan@linux.intel.com


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