drm/nve0/fifo: allow for future binding of ppp contexts

No support for the class yet, but will be pulled in with Maarten's Fermi
vdec patches.  The Kepler PPP class is identical.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c

@@ -140,6 +140,7 @@ nve0_fifo_context_attach(struct nouveau_object *parent,
 	case NVDEV_ENGINE_COPY1: addr = 0x0210; break;
 	case NVDEV_ENGINE_BSP  : addr = 0x0270; break;
 	case NVDEV_ENGINE_VP   : addr = 0x0250; break;
+	case NVDEV_ENGINE_PPP  : addr = 0x0260; break;
 	default:
 		return -EINVAL;
 	}
@@ -176,6 +177,7 @@ nve0_fifo_context_detach(struct nouveau_object *parent, bool suspend,
 	case NVDEV_ENGINE_COPY1: addr = 0x0210; break;
 	case NVDEV_ENGINE_BSP  : addr = 0x0270; break;
 	case NVDEV_ENGINE_VP   : addr = 0x0250; break;
+	case NVDEV_ENGINE_PPP  : addr = 0x0260; break;
 	default:
 		return -EINVAL;
 	}