ACPI: make device_attribute const

Make these const as they are only passed as an argument to the function
device_create_file and device_remove_file and the corresponding
arguments are of type const.
Done using Coccinelle

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/battery.c

@@ -620,7 +620,7 @@ static ssize_t acpi_battery_alarm_store(struct device *dev,
 	return count;
 }
 
-static struct device_attribute alarm_attr = {
+static const struct device_attribute alarm_attr = {
 	.attr = {.name = "alarm", .mode = 0644},
 	.show = acpi_battery_alarm_show,
 	.store = acpi_battery_alarm_store,

drivers/acpi/sbs.c

@@ -476,7 +476,7 @@ static ssize_t acpi_battery_alarm_store(struct device *dev,
 	return count;
 }
 
-static struct device_attribute alarm_attr = {
+static const struct device_attribute alarm_attr = {
 	.attr = {.name = "alarm", .mode = 0644},
 	.show = acpi_battery_alarm_show,
 	.store = acpi_battery_alarm_store,