lima: fix PP stack size

PP stack size should be set to maximum PP stack size, not to stack size of
last shader.

Fixes: 27e7603c ("lima: fix ppir spill stack allocation")
Tested-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
56 jobs for !2386 with lima-fix-pp-stack-size in 26 minutes and 44 seconds (queued for 4 seconds)
merge request