au6601: make dma read, work

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
au6601: make dma write work

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
au6601: fix suspend resume

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>