[ARM] pxa/colibri-pxa300: fix AC97 init

The wrong CONFIG defines were checked, and the <mach/audio.h>
include was missing

Signed-off-by: pieter <p.grimmerink@inepro.com>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>