drm/nvc0-/gr: handle fwmthd interrupts in ucode

Compute code in mesa triggers one of these, hanging the engine.  Let's
at least ack the request for now to avoid the hang.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/fuc/hub.fuc
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/fuc/hubnv108.fuc5.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/fuc/hubnvc0.fuc.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/fuc/hubnvd7.fuc.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/fuc/hubnve0.fuc.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/fuc/hubnvf0.fuc.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/fuc/macros.fuc
Simple merge