power: supply: bq25980_charger: Constify reg_default array

Static 'struct reg_default' array is not modified so can be changed to
const for more safety.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/supply/bq25980_charger.c

···
 	int watchdog_timer;
 };
 
-static struct reg_default bq25980_reg_defs[] = {
+static const struct reg_default bq25980_reg_defs[] = {
 	{BQ25980_BATOVP, 0x5A},
 	{BQ25980_BATOVP_ALM, 0x46},
 	{BQ25980_BATOCP, 0x51},
···
 	{BQ25980_CHRGR_CTRL_6, 0x0},
 };
 
-static struct reg_default bq25975_reg_defs[] = {
+static const struct reg_default bq25975_reg_defs[] = {
 	{BQ25980_BATOVP, 0x5A},
 	{BQ25980_BATOVP_ALM, 0x46},
 	{BQ25980_BATOCP, 0x51},
···
 	{BQ25980_CHRGR_CTRL_6, 0x0},
 };
 
-static struct reg_default bq25960_reg_defs[] = {
+static const struct reg_default bq25960_reg_defs[] = {
 	{BQ25980_BATOVP, 0x5A},
 	{BQ25980_BATOVP_ALM, 0x46},
 	{BQ25980_BATOCP, 0x51},