hwmon: (gsc-hwmon) constify read-only struct regmap_bus

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

Signed-off-by: Javier Carrasco <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>

drivers/hwmon/gsc-hwmon.c

···
 	struct hwmon_chip_info chip;
 };
 
-static struct regmap_bus gsc_hwmon_regmap_bus = {
+static const struct regmap_bus gsc_hwmon_regmap_bus = {
 	.reg_read = gsc_read,
 	.reg_write = gsc_write,
 };