[PATCH][wwwdocs] Add Cortex-A53 erratum workaround note to AArch64 changes for 4.9

[Kyrill Tkachov]

Hi all,

Considering that the erratum workaround option was backported to 4.9, I 
assume we'll need an item for that
in the changes.html for that branch?

The text is the same as in the trunk version that I committed recently.

Ok?
Thanks,
Kyrill
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