ALSA: asoc: at32 - DAI struct merge and enable_pin() change.

This adds support for the recent DAI struct merge and new DAPM pin API.

Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>