alpha/drm: Cleanup Alpha support in DRM generic code

Remove an obsolete Alpha adjustment, and modify another,
to go with the current Alpha architecture support.
Signed-off-by: NJay Estabrook <jay.estabrook@gmail.com>
Tested-by: NMatt Turner <mattst88@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_bufs.c

@@ -182,9 +182,6 @@ static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 			kfree(map);
 			return -EINVAL;
 		}
-#endif
-#ifdef __alpha__
-		map->offset += dev->hose->mem_space->start;
 #endif
 		/* Some drivers preinitialize some maps, without the X Server
 		 * needing to be aware of it.  Therefore, we just return success

drivers/gpu/drm/drm_vm.c

@@ -526,7 +526,7 @@ static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
 {
 #ifdef __alpha__
-	return dev->hose->dense_mem_base - dev->hose->mem_space->start;
+	return dev->hose->dense_mem_base;
 #else
 	return 0;
 #endif