drm/nvc0-/gr: generate grctx template at init time, not first context ctor

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

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/ctxnvc0.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/ctxnve0.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/nvc0.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/graph/nve0.c
Simple merge