drm/nouveau/mc: convert to new-style nvkm_subdev

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c b/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c
index 2f22af2..8fd26fa 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c
@@ -1339,12 +1339,12 @@
 
 	if (gr->firmware) {
 		/* load fuc microcode */
-		nvkm_mc(gr)->unk260(nvkm_mc(gr), 0);
+		nvkm_mc_unk260(device->mc, 0);
 		gf100_gr_init_fw(gr, 0x409000, &gr->fuc409c,
 						 &gr->fuc409d);
 		gf100_gr_init_fw(gr, 0x41a000, &gr->fuc41ac,
 						 &gr->fuc41ad);
-		nvkm_mc(gr)->unk260(nvkm_mc(gr), 1);
+		nvkm_mc_unk260(device->mc, 1);
 
 		/* start both of them running */
 		nvkm_wr32(device, 0x409840, 0xffffffff);
@@ -1439,7 +1439,7 @@
 	}
 
 	/* load HUB microcode */
-	nvkm_mc(gr)->unk260(nvkm_mc(gr), 0);
+	nvkm_mc_unk260(device->mc, 0);
 	nvkm_wr32(device, 0x4091c0, 0x01000000);
 	for (i = 0; i < oclass->fecs.ucode->data.size / 4; i++)
 		nvkm_wr32(device, 0x4091c4, oclass->fecs.ucode->data.data[i]);
@@ -1462,7 +1462,7 @@
 			nvkm_wr32(device, 0x41a188, i >> 6);
 		nvkm_wr32(device, 0x41a184, oclass->gpccs.ucode->code.data[i]);
 	}
-	nvkm_mc(gr)->unk260(nvkm_mc(gr), 1);
+	nvkm_mc_unk260(device->mc, 1);
 
 	/* load register lists */
 	gf100_gr_init_csdata(gr, grctx->hub, 0x409000, 0x000, 0x000000);