ASoC: pxa/raumfeld: adopt new snd_soc_dai_set_pll() API

ALSA's for-2.6.33 branch has a new source argument to
snd_soc_dai_set_pll().

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>