clk: meson: a1: pll: Constify struct regmap_config

`a1_pll_regmap_cfg` is not modified and can be declared as const to
 move its data to a read-only section.

Signed-off-by: Javier Carrasco <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jerome Brunet <[email protected]>

Author: javiercarrascocruz

drivers/clk/meson/a1-pll.c

@@ -295,7 +295,7 @@ static struct clk_regmap *const a1_pll_regmaps[] = {
 	&hifi_pll,
 };
 
-static struct regmap_config a1_pll_regmap_cfg = {
+static const struct regmap_config a1_pll_regmap_cfg = {
 	.reg_bits   = 32,
 	.val_bits   = 32,
 	.reg_stride = 4,