drm: Initialize the AGP structure's base address at init rather than enable.

Not all drivers call enable (intel), but they would still like to use this
member in driver code.

Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/drm_agpsupport.c b/drivers/char/drm/drm_agpsupport.c
index 214f4fb..9468c78 100644
--- a/drivers/char/drm/drm_agpsupport.c
+++ b/drivers/char/drm/drm_agpsupport.c
@@ -166,7 +166,6 @@
 
 	dev->agp->mode = mode.mode;
 	agp_enable(dev->agp->bridge, mode.mode);
-	dev->agp->base = dev->agp->agp_info.aper_base;
 	dev->agp->enabled = 1;
 	return 0;
 }
@@ -417,7 +416,7 @@
 	INIT_LIST_HEAD(&head->memory);
 	head->cant_use_aperture = head->agp_info.cant_use_aperture;
 	head->page_mask = head->agp_info.page_mask;
-
+	head->base = head->agp_info.aper_base;
 	return head;
 }