fpga: dfl: make dfl_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the dfl_bus_type 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>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20240204-bus_cleanup-fpga-v1-1-dae8b5bf7220@marliere.netSigned-off-by: Xu Yilun <yilun.xu@linux.intel.com>

drivers/fpga/dfl.c

@@ -327,7 +327,7 @@ static struct attribute *dfl_dev_attrs[] = {
 };
 ATTRIBUTE_GROUPS(dfl_dev);
 
-static struct bus_type dfl_bus_type = {
+static const struct bus_type dfl_bus_type = {
 	.name		= "dfl",
 	.match		= dfl_bus_match,
 	.probe		= dfl_bus_probe,