ARM: pxa: enable pxa-pcm-audio on pxa210/pxa25x platform

pxa25x platforms were left out of major ASoC Update patch.
Since f0fba2ad a registration of pxa-pcm-audio device is required for
ASoC to function on pxa platforms. Register one also for pxa210/pxa25x.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>