arm-soc: support for new SoCs

Three new system-on-chip models are supported: the st-ericsson u9540
in ux500, the sam9n12 in at91 and the emma ev2 in shmobile.

Emma is a little bit special because it is completely unrelated to
the classic shmobile models, but the new Renesas rmobile SoCs are a
combination of things from both Emma and shmobile, so it was decided to
have them all live in one directory.

This also contains updates to existing shmobile soc code as well as some
related board changes due to dependencies.
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