ALSA: ASoC: Export DAI and codec for TLV320AIC26

This fixes sparse warnings and allows non-OpenFirmware systems to attempt
to bind to the device.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>