ASoC: SOF: amd: Fix for reading position updates from stream box.

By default the position updates are read from dsp box when streambox
size is not defined.if the streambox size is defined to some value
then position updates can be read from the streambox.

Signed-off-by: V sujith kumar Reddy <Vsujithkumar.Reddy@amd.com>
Link: https://lore.kernel.org/r/20221123121911.3446224-2-vsujithkumar.reddy@amd.corp-partner.google.com


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