vdpa: make vdpa_bus const

Now that the driver core can properly handle constant struct bus_type,
move the vdpa_bus variable to be a constant structure as well,
placing it into read-only memory which can not be modified at runtime.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Message-Id: <20240204-bus_cleanup-vdpa-v1-1-1745eccb0a5c@marliere.net>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/vdpa/vdpa.c

@@ -115,7 +115,7 @@ static const struct attribute_group vdpa_dev_group = {
 };
 __ATTRIBUTE_GROUPS(vdpa_dev);
 
-static struct bus_type vdpa_bus = {
+static const struct bus_type vdpa_bus = {
 	.name  = "vdpa",
 	.dev_groups = vdpa_dev_groups,
 	.match = vdpa_dev_match,