intel: fix the scratch space calculation for TGL

TGL is listed as having 16 EUs per subslice, so use the correct number
during scratch space calculation.

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
38 jobs for !3612 with scratch-fixes-1 in 37 minutes and 31 seconds (queued for 2 seconds)
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