ARM: dts: pxa3xx: Add Raumfeld DTS files

This patch adds a set of DTS files that support all PXA3xx based Raumfeld
audio hardware devices.

Common nodes are factored out into 'common' and 'tuneable-clock' include
files to keep the top-level DTS files smaller.

Signed-off-by: Daniel Mack <daniel@zonque.org>
[Robert: Reordered Makefile in alphabetical order]
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>