Genesi Efika MX/SB support improvements

Hi,

This patch series aims at improving current efika mx support and adds support for efika smartbook. Given the similarities between the two systems, the first patch moves mx some code into a new file which will contain code shared by both systems and the last patch adds support for efika smartbook.

Change since v1:
- rebased on ehci cleanup patches (which seems to be now merged in Sascha's imx for-next tree)
- use machine_is_* in initcalls
- drop dead uart-related code

Arnaud

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