drm/ttm: Remove file_page_offset parameter from ttm_bo_device_init()

The parameter file_page_offset is a constant shared by all drivers. Just
replace it with the constant itself.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/ast/ast_ttm.c

@@ -178,7 +178,6 @@ int ast_mm_init(struct ast_private *ast)
 	ret = ttm_bo_device_init(&ast->ttm.bdev,
 				 &ast_bo_driver,
 				 dev->anon_inode->i_mapping,
-				 DRM_FILE_PAGE_OFFSET,
 				 true);
 	if (ret) {
 		DRM_ERROR("Error initialising bo driver; %d\n", ret);