drm/nv50-/disp: audit and version SOR_HDMI_PWR method

The full object interfaces are about to be exposed to userspace, so we
need to check for any security-related issues and version the structs
to make it easier to handle any changes we may need in the future.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c b/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c
index 9381b16..bb5caa7 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nv50.c
@@ -909,6 +909,10 @@
 		if (!priv->sor.hda_eld)
 			return -ENODEV;
 		return priv->sor.hda_eld(object, priv, data, size, head, outp);
+	case NV50_DISP_MTHD_V1_SOR_HDMI_PWR:
+		if (!priv->sor.hdmi)
+			return -ENODEV;
+		return priv->sor.hdmi(object, priv, data, size, head, outp);
 	default:
 		break;
 	}