radeonsi: fix scratch buffer WAVESIZE setting leading to corruption

Cc: 19.2 19.1 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
22 jobs for !1714 with scratch-fix in 48 minutes and 51 seconds (queued for 15 minutes and 20 seconds)
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