ASoC: multi-component: Fix reference to moved header file, which was unused anyway.

 Removed #include of pxa2xx-pcm.h

Signed-off-by: Ian Lartey <ian@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>