i965/skl: (trivial) Remove invalid comment about thread counts
i965/skl: (trivial) Remove invalid comment about thread counts

This should have been a part of:
commit 7eaacc1678195738fab3bb98870828611cae066d
Author: Ben Widawsky <benjamin.widawsky@intel.com>
Date:   Wed Jul 29 12:35:24 2015 -0700

    i965/skl: Add production thread counts and URB size

Signed-off-by: Ben Widawsky <73675debcd8a436be48ec22211dcf44fe0df0a64@bwidawsk.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler