nouveau: fix disabling the nonstall irq due to storm code. (v2)

Status from this message: Applied to drm-misc-fixes, thanks!

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#	Subject and files	Size	Replies	Applied
1/2	nouveau: fix disabling the nonstall irq due to storm code. (v2)`drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c` `drivers/gpu/drm/nouveau/nvkm/engine/fifo/ga100.c` `drivers/gpu/drm/nouveau/nvkm/engine/fifo/ga102.c` +2 more	+20 -9	5 replies
2/2	nouveau: Membar before between semaphore writes and the interrupt`drivers/gpu/drm/nouveau/gv100_fence.c` `drivers/gpu/drm/nouveau/include/nvhw/class/clc36f.h`	+91 -1	2 replies

No Reviewed-by, Acked-by or Tested-by trailers for v1 yet.