drm/nouveau: use the same packet header macros as userspace

Cosmetic cleanup only.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 4b1cf74..b670b0d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -446,13 +446,13 @@
 		goto fail;
 
 	if (dev_priv->card_type < NV_C0) {
-		BEGIN_RING(chan, NvSubSw, NV_SW_PAGE_FLIP, 1);
+		BEGIN_NV04(chan, NvSubSw, NV_SW_PAGE_FLIP, 1);
 		OUT_RING  (chan, 0x00000000);
 		OUT_RING  (chan, 0x00000000);
 	} else {
-		BEGIN_NVC0(chan, 2, 0, NV10_SUBCHAN_REF_CNT, 1);
+		BEGIN_NVC0(chan, 0, NV10_SUBCHAN_REF_CNT, 1);
 		OUT_RING  (chan, ++chan->fence.sequence);
-		BEGIN_NVC0(chan, 8, 0, NVSW_SUBCHAN_PAGE_FLIP, 0x0000);
+		BEGIN_IMC0(chan, 0, NVSW_SUBCHAN_PAGE_FLIP, 0x0000);
 	}
 	FIRE_RING (chan);