[U-Boot] Add ARM errata workaround 852421 and 852423 for Cortex-A17

Mon May 8 19:43:24 UTC 2017

On Wed, Apr 26, 2017 at 04:18:01PM -0500, Nisal Menuka wrote:

> ARM errata 852421 and 852423 applies to r1p0, r1p1 and r1p2
> revisions of Cortex-A17 processors. These workarounds
> exist in Linux kernel and I thought it would be better
> to add them in to U-Boot.
> 
> Signed-off-by: Nisal Menuka <nisalmenuka23 at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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