ASoC: cygnus: Add EXPORT_SYMBOL for helper function

The helper function cygnus_ssp_set_custom_fsync_width() is intended
to be called from an ASoC machine driver, need to export symbol
if using modules.
Signed-off-by: NLori Hikichi <lori.hikichi@broadcom.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/bcm/cygnus-ssp.c

@@ -842,6 +842,7 @@ int cygnus_ssp_set_custom_fsync_width(struct snd_soc_dai *cpu_dai, int len)
 		return -EINVAL;
 	}
 }
+EXPORT_SYMBOL_GPL(cygnus_ssp_set_custom_fsync_width);
 
 static int cygnus_ssp_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
 {