ab8500_fg: Get rid of 'struct battery_type'

The struct is duplicated, plus causes the following flood:

  CC      drivers/power/ab8500_fg.o
ab8500_fg.c: In function ‘ab8500_fg_get_ext_psy_data’:
b8500_fg.c:2081:8: warning: assignment from incompatible pointer type [enabled by default]

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
index 180c21a..b7e12c8 100644
--- a/drivers/power/ab8500_fg.c
+++ b/drivers/power/ab8500_fg.c
@@ -2077,7 +2077,8 @@
 			switch (ext->type) {
 			case POWER_SUPPLY_TYPE_BATTERY:
 				if (!di->flags.batt_id_received) {
-					const struct battery_type *b;
+					const struct abx500_battery_type *b;
+
 					b = &(di->bat->bat_type[di->bat->batt_id]);
 
 					di->flags.batt_id_received = true;