drm/nouveau/core/object: separate oclass data out into its own header

Want to be able to include this from core/device.h without pulling in
core/object.h.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/core/object.h

 #ifndef __NVKM_OBJECT_H__
 #define __NVKM_OBJECT_H__
-#include <core/os.h>
-#include <core/debug.h>
+#include <core/oclass.h>
 struct nvkm_event;
 struct nvkm_gpuobj;
-struct nvkm_oclass;
 
 struct nvkm_object {
 	const struct nvkm_object_func *func;
@@ -66,28 +64,4 @@ bool nvkm_object_insert(struct nvkm_object *);
 void nvkm_object_remove(struct nvkm_object *);
 struct nvkm_object *nvkm_object_search(struct nvkm_client *, u64 object,
 				       const struct nvkm_object_func *);
-
-struct nvkm_sclass {
-	int minver;
-	int maxver;
-	s32 oclass;
-	const struct nvkm_object_func *func;
-	int (*ctor)(const struct nvkm_oclass *, void *data, u32 size,
-		    struct nvkm_object **);
-};
-
-struct nvkm_oclass {
-	int (*ctor)(const struct nvkm_oclass *, void *data, u32 size,
-		    struct nvkm_object **);
-	struct nvkm_sclass base;
-	const void *priv;
-	const void *engn;
-	u32 handle;
-	u8  route;
-	u64 token;
-	u64 object;
-	struct nvkm_client *client;
-	struct nvkm_object *parent;
-	struct nvkm_engine *engine;
-};
 #endif

drivers/gpu/drm/nouveau/include/nvkm/core/oclass.h

+#ifndef __NVKM_OCLASS_H__
+#define __NVKM_OCLASS_H__
+#include <core/os.h>
+#include <core/debug.h>
+struct nvkm_oclass;
+struct nvkm_object;
+
+struct nvkm_sclass {
+	int minver;
+	int maxver;
+	s32 oclass;
+	const struct nvkm_object_func *func;
+	int (*ctor)(const struct nvkm_oclass *, void *data, u32 size,
+		    struct nvkm_object **);
+};
+
+struct nvkm_oclass {
+	int (*ctor)(const struct nvkm_oclass *, void *data, u32 size,
+		    struct nvkm_object **);
+	struct nvkm_sclass base;
+	const void *priv;
+	const void *engn;
+	u32 handle;
+	u8  route;
+	u64 token;
+	u64 object;
+	struct nvkm_client *client;
+	struct nvkm_object *parent;
+	struct nvkm_engine *engine;
+};
+#endif