drm: update support for drm pci buffers

The DRM needs to change the drm_pci interface for FreeBSD compatiblity,
this patch introduces the drm_dma_handle_t and uses it in the Linux code.

From: Tonnerre Lombard, Eric Anholt, and Sergey Vlasov
Signed-off-by: David Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/drm_vm.c b/drivers/char/drm/drm_vm.c
index 644ec9da..675d239 100644
--- a/drivers/char/drm/drm_vm.c
+++ b/drivers/char/drm/drm_vm.c
@@ -210,6 +210,8 @@
 		}
 
 		if(!found_maps) {
+			drm_dma_handle_t dmah;
+
 			switch (map->type) {
 			case _DRM_REGISTERS:
 			case _DRM_FRAME_BUFFER:
@@ -229,8 +231,10 @@
 			case _DRM_SCATTER_GATHER:
 				break;
 			case _DRM_CONSISTENT:
-				drm_pci_free(dev, map->size, map->handle,
-					     map->offset);
+				dmah.vaddr = map->handle;
+				dmah.busaddr = map->offset;
+				dmah.size = map->size;
+				__drm_pci_free(dev, &dmah);
 				break;
 			}
 			drm_free(map, sizeof(*map), DRM_MEM_MAPS);