New umbrella-port for PowerPC-based evaluation boards.

The first board to be included here is the port to the 405GP-based
Walnut evaluation board, which up until now lived in arch/walnut.

arch/waln

New umbrella-port for PowerPC-based evaluation boards.

The first board to be included here is the port to the 405GP-based
Walnut evaluation board, which up until now lived in arch/walnut.

arch/walnut will go away soon, once all the remaining walnut-isms
in the tree have been dealt with.

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