ASoC: SOF: Intel: hda-stream: export stream_get_position() helper

Export this helper so that we can report the DPIB position if the BPT
DMA do not complete - this is very useful to see if the DMA started or
gets stuck somehow with invalid bandwidth configurations.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Link: https://lore.kernel.org/r/20240503135221.229202-2-pierre-louis.bossart@linux.intel.com


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