ab8500: Turn unneeded global symbols into local ones

The patch fixes the following sparse warning:

drivers/power/ab8500_charger.c:1619:6: warning: symbol 'ab8500_charger_detect_usb_type_work' was not declared. Should it be static?
drivers/power/abx500_chargalg.c:1709:24: warning: symbol 'abx500_chargalg_sysfs_ops' was not declared. Should it be static?
drivers/power/ab8500_fg.c:2328:24: warning: symbol 'ab8500_fg_sysfs_ops' was not declared. Should it be static?
Signed-off-by: NAnton Vorontsov <anton.vorontsov@linaro.org>

drivers/power/ab8500_charger.c

@@ -1616,7 +1616,7 @@ static void ab8500_charger_ac_work(struct work_struct *work)
  *
  * Detect the type of USB plugged
  */
-void ab8500_charger_detect_usb_type_work(struct work_struct *work)
+static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
 {
 	int ret;
 

drivers/power/ab8500_fg.c

@@ -2325,7 +2325,7 @@ ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf,
 	return entry->store(di, buf, count);
 }
 
-const struct sysfs_ops ab8500_fg_sysfs_ops = {
+static const struct sysfs_ops ab8500_fg_sysfs_ops = {
 	.show = ab8500_fg_show,
 	.store = ab8500_fg_store,
 };

drivers/power/abx500_chargalg.c

@@ -1706,7 +1706,7 @@ static struct attribute *abx500_chargalg_chg[] = {
 	NULL
 };
 
-const struct sysfs_ops abx500_chargalg_sysfs_ops = {
+static const struct sysfs_ops abx500_chargalg_sysfs_ops = {
 	.store = abx500_chargalg_sysfs_charger,
 };