drm/nouveau/nvkm: bump maximum number of NVDEC

RM (and GH100) support 8 NVDEC instances.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230918202149.4343-3-skeggsb@gmail.com

drivers/gpu/drm/nouveau/include/nvkm/core/layout.h

@@ -42,7 +42,7 @@ NVKM_LAYOUT_ONCE(NVKM_ENGINE_MSENC   , struct nvkm_engine  ,    msenc)
 NVKM_LAYOUT_ONCE(NVKM_ENGINE_MSPDEC  , struct nvkm_engine  ,   mspdec)
 NVKM_LAYOUT_ONCE(NVKM_ENGINE_MSPPP   , struct nvkm_engine  ,    msppp)
 NVKM_LAYOUT_ONCE(NVKM_ENGINE_MSVLD   , struct nvkm_engine  ,    msvld)
-NVKM_LAYOUT_INST(NVKM_ENGINE_NVDEC   , struct nvkm_nvdec   ,    nvdec, 5)
+NVKM_LAYOUT_INST(NVKM_ENGINE_NVDEC   , struct nvkm_nvdec   ,    nvdec, 8)
 NVKM_LAYOUT_INST(NVKM_ENGINE_NVENC   , struct nvkm_nvenc   ,    nvenc, 3)
 NVKM_LAYOUT_ONCE(NVKM_ENGINE_NVJPG   , struct nvkm_engine  ,    nvjpg)
 NVKM_LAYOUT_ONCE(NVKM_ENGINE_OFA     , struct nvkm_engine  ,      ofa)