reset: sti: Make reset_control_ops const

The syscfg_reset_ops structure is never modified. Make it const.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/reset/sti/reset-syscfg.c

@@ -134,7 +134,7 @@ static int syscfg_reset_status(struct reset_controller_dev *rcdev,
 	return rst->active_low ? !ret_val : !!ret_val;
 }
 
-static struct reset_control_ops syscfg_reset_ops = {
+static const struct reset_control_ops syscfg_reset_ops = {
 	.reset    = syscfg_reset_dev,
 	.assert   = syscfg_reset_assert,
 	.deassert = syscfg_reset_deassert,