hwmon: (core) Make hwmon_class const

Now that the driver core allows for struct class to be in read-only
memory, mark hwmon_class as const.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20240614-class-const-hwmon-v1-1-27b910d06a90@weissschuh.netSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/hwmon.c

@@ -137,7 +137,7 @@ static void hwmon_dev_release(struct device *dev)
 	kfree(hwdev);
 }
 
-static struct class hwmon_class = {
+static const struct class hwmon_class = {
 	.name = "hwmon",
 	.dev_groups = hwmon_dev_attr_groups,
 	.dev_release = hwmon_dev_release,