testing-board branch: rebase to RMK's devel-stable?

[Kevin Hilman]

Hi Tony,

Your testing-board branch currently has a couple new boards that are
missing the boot_params to atag_offset conversion (patch below.)

There's a patch below to fix this, but maybe it's better to just rebase
your testing-board branch onto Russell's devel-stable branch (where he's
merged the seris from Nico) so any board stuff we add is sure to do it
correctly.

Kevin