ASoC: SOF: probes: Check ops before memory allocation

We may check ops before spending resources on memory allocation.
While at it, utilize dev_get_platdata() helper.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20221117103223.74425-1-andriy.shevchenko@linux.intel.com


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