drm/nouveau/top/tu104: initial support

Appears to be compatible with GK104.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/engine/device/base.c

@@ -2440,6 +2440,7 @@ nv164_chipset = {
 	.bios = nvkm_bios_new,
 	.devinit = tu104_devinit_new,
 	.pci = gp100_pci_new,
+	.top = gk104_top_new,
 };
 
 static int