clk: mmp: Make reset_control_ops const

The mmp_clk_reset_ops structure is never modified. Make it const.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/mmp/reset.c

@@ -74,7 +74,7 @@ static int mmp_clk_reset_deassert(struct reset_controller_dev *rcdev,
 	return 0;
 }
 
-static struct reset_control_ops mmp_clk_reset_ops = {
+static const struct reset_control_ops mmp_clk_reset_ops = {
 	.assert		= mmp_clk_reset_assert,
 	.deassert	= mmp_clk_reset_deassert,
 };