ASoC: topology: Use unload() op directly

struct snd_soc_dobj only needs pointer to the unload function, instead
however, there is pointer to all topology operations. Change code to use
the function pointer instead of pointer to structure containing all
operations.

Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Link: https://lore.kernel.org/r/20230127231111.937721-12-amadeuszx.slawinski@linux.intel.com


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