imx6qdl udoo board has an AC97 codec.

Add support for it by default.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Acked-by: NMaciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>