Assign each dai_link a unique name to avoid this run-time error.

[   18.978043] pcm030-audio-fabric sound.2:  wm9712-hifi <-> mpc5200-psc-ac97.0 mapping ok
[   19.003179] sysfs: cannot create duplicate filename '/devices/sound.2/AC97'
Signed-off-by: NEric Millbrandt <emillbrandt@dekaresearch.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>