ARM: ixp4xx regression (bisected) since v3.5-rc1

[Brad Parker]

I am using an ADI Pronghorn Metro board and noticed an issue with any
kernel >= 3.5-rc1 where the board would not boot (or at least no
console messages appear over the serial port), just giving
"Uncompressing Linux... done, booting the kernel." and stopping there.

I ran a git bisect between v3.4 and v3.5 and narrowed the problem down
to this commit:

---
c23bfc3835173f5229b2503e3b616001a28affad is the first bad commit
commit c23bfc3835173f5229b2503e3b616001a28affad
Author: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Date:   Sat Mar 10 12:49:16 2012 +0000

    ARM: PCI: provide a default bus scan implementation
---

I then reversed this commit on 3.7.9 and the board booted
successfully. I'm not sure if this affects other boards of the same
arch or not, I only have access to a Pronghorn which also requires a
patch for the board files as they are not part of mainline.
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