clk: sunxi-ng r40: Constify struct regmap_config

`sun8i_r40_ccu_regmap_config` is not modified and can be declared as
const to move its data to a read-only section.
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240703-clk-const-regmap-v1-9-7d15a0671d6f@gmail.comReviewed-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/sunxi-ng/ccu-sun8i-r40.c

@@ -1292,7 +1292,7 @@ static bool sun8i_r40_ccu_regmap_accessible_reg(struct device *dev,
 	return false;
 }
 
-static struct regmap_config sun8i_r40_ccu_regmap_config = {
+static const struct regmap_config sun8i_r40_ccu_regmap_config = {
 	.reg_bits	= 32,
 	.val_bits	= 32,
 	.reg_stride	= 4,