The code for bytes_ext_get and bytes_ext_volatile_get is identical with
the only difference is that in case of volatile_get we refresh the data
from the DSP before returning it to user space.

Convert the callbacks to a simple wrapper for the same function.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20230313110344.16644-3-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>