phycore-ac97: add ac97 to cardname

We have different codecs on the pcm038 (ac97 wm9712 and mc13783).
To make alsactl restore work correctly these should have different
names.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>