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powerpc: Add AmigaOne platform, a subclass of MPC85xx

Description

powerpc: Add AmigaOne platform, a subclass of MPC85xx

Summary:
The AmigaOne platform, encompassing the X5000 and A1222 at this time, is
based on the mpc85xx platform, but includes some things not listed in
the device tree. Some custom devices, like CPLD, could be added to the
device tree with an overlay, or other means. However, some cannot
easily be done, such as the power button interrupt.

The directory will also become a location to add AmigaOne platform drivers,
such as the aforementioned CPLD, and its children.

Reviewed by: bdragon
Differential Revision: https://reviews.freebsd.org/D21829