[AGPGART] Further constification.

Make agp_bridge_driver->aperture_sizes and ->masks const.
Also agp_bridge_data->driver

Signed-off-by: Dave Jones <davej@redhat.com>
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index 7923337..f902d71 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -1340,7 +1340,7 @@
 }
 EXPORT_SYMBOL(agp3_generic_cleanup);
 
-struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
+const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
 {
 	{4096, 1048576, 10,0x000},
 	{2048,  524288, 9, 0x800},