drm/via: use drm_mm instead of drm_sman

To make the transition in a piece-wise and bisectable way possible,
I've hijacked the ->owner_list from drm_sman. While transitioning, the
list_add was done by the driver, while the list_del was still done by
the dying sman code.

Now that we are in full control of ->owner_list, do the list_del
ourselves.

v2: Better explain the list_del trickery as suggested by Chris Wilson.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/via/via_drv.h

@@ -24,7 +24,7 @@
 #ifndef _VIA_DRV_H_
 #define _VIA_DRV_H_
 
-#include "drm_sman.h"
+#include "drm_mm.h"
 #define DRIVER_AUTHOR	"Various"
 
 #define DRIVER_NAME		"via"
@@ -88,9 +88,10 @@ typedef struct drm_via_private {
 	uint32_t irq_pending_mask;
 	int *irq_map;
 	unsigned int idle_fault;
-	struct drm_sman sman;
 	int vram_initialized;
+	struct drm_mm vram_mm;
 	int agp_initialized;
+	struct drm_mm agp_mm;
 	/** Mapping of userspace keys to mm objects */
 	struct idr object_idr;
 	unsigned long vram_offset;