arm-soc: late at91 changes

This series was originally sent for inclusion in v3.5 but missed out
twice, first time because it was late for v3.5 and we decided not to
push it then, and this time because the maintainer was on a long
vacation before the merge window and nobody noticed that it was missing
from the v3.6 list.

The main purpose of this series is to move over the at91 board files
to use the atmel-mci driver instead of the old at91_mci that is
scheduled for removal in v3.7.
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