regulator: ti-abb: Constify ti_abb_reg_ops

The only usage of ti_abb_reg_ops is to assign its address to the ops
field in the regulator_desc struct, which is a const pointer. Make it
const to allow the compiler to put it in read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Link: https://lore.kernel.org/r/20200913084114.8851-6-rikard.falkeborn@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/ti-abb-regulator.c

@@ -619,7 +619,7 @@ static int ti_abb_init_table(struct device *dev, struct ti_abb *abb,
 	return 0;
 }
 
-static struct regulator_ops ti_abb_reg_ops = {
+static const struct regulator_ops ti_abb_reg_ops = {
 	.list_voltage = regulator_list_voltage_table,
 
 	.set_voltage_sel = ti_abb_set_voltage_sel,