ASoC: SOF: ipc4: Add define for the outbox window index

Instead of using the index number directly, add a define for the outbox
window index.
It is always window 1 with IPC4.

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

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