arm/dts: twl4030: Add DTS file for twl4030 PM + Audio IC

Add a dedicated DTS file for the twl4030/5030 Power + Audio IC.
This chip is a big SoC that will be reused in a lot of various
OMAP3 boards.

Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Rob Herring <rob.herring@calxeda.com>