[U-Boot] [PATCH v2] mtd: resync with Linux-3.7.1

[Sergey Lapin]

Dear Scott,

> I tried booting on P2020RDB-PC_NAND, and got this:
> 
> >L2:    512 KB already enabled, moving to 0xf8f80000
> >NAND:  BUG: failure at nand_base.c:3214/nand_scan_tail()!
> >BUG!
> >### ERROR ### Please RESET the board ###
> 
> It boots fine without this patch.  nand_base.c:3214 is complaining about
> missing ecc.strength.  You need to update existing U-Boot drivers
> for new
> API so that nothing breaks.  Ask maintainers of particular drivers for
> help if necessary.

Found the culprit. Will resubmit shortly.