ASoC: SOF: loader: No need to export snd_sof_fw_parse_ext_data()

snd_sof_fw_parse_ext_data() is used only internally within loader.c and
there is no need to export it.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@gmail.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20210915122116.18317-7-peter.ujfalusi@linux.intel.com


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