[PATCH] mt7621: Initial Atel platform support

[Peter Naulls]

I'm expecting this to need to be tidied up based upon feedback, but here's the 
first try of support for the two mt7621 atel platforms I've been working on.

I have a number of smaller changes to go with this, but these are the top level
pieces to get started that I want to get right first.

Signed-off-by: Peter Naulls <peter at chocky.org>
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