linux-next: remove the siox tree

[Stephen Rothwell]

Hi all,

The siox tree (https://git.pengutronix.de/git/ukl/linux#siox/next) has
not bee updated in more than a year, so I have removed it from linux-next.
Please let me know if/when you want it reinstated.

-- 
Cheers,
Stephen Rothwell

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