ASoC: NUC900: patch for fix build error

This patch is to change 'auido.h' to 'audio.h' for
fixing nuc900 alsa driver build error.

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>