ASoC: SOF: Add helper macro to be used to get an IPC ops

In preparation to a case when the DSP is not used.
In this case the IPC communication itself has no meaning and we might
not even have sdev->ipc allocated at all.

The sof_ipc_get_ops() macro can be used to get a named IPC ops struct or
return NULL if the sdev->ipc is not allocated.

Signed-off-by: Peter Ujfalusi <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Reviewed-by: Ranjani Sridharan <[email protected]>
Reviewed-by: Bard Liao <[email protected]>
Reviewed-by: Rander Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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