A few more last-minute regression fixes, prepared jointly by me and David

Woodhouse:

* Revert pxa3xx to its old name to avoid breaking existing 'mtdparts=' boot
  strings.

* Return GPMI NAND to its legacy ECC layout for backwards compatibility. We
  will revisit this in 3.13.

A note from David on the latter fix: "This leaves a harmless cosmetic warning
about an unused function. At this point in the cycle I really don't care."
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