Remove sparcv8 support

[David Miller]

From: Sam Ravnborg <sam@ravnborg.org>
Date: Mon, 7 Nov 2016 22:20:50 +0100

> casemul.S is missing.
> So all the fun kernel stuf was not included in the patch...

Ugh, someone asked me about this but asked me privately so I only
sent the corrected patch to them privately :-/

Here it is:
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