ab8500_fg: Get rid of 'struct v_to_cap'

The struct is duplicated, plus when used it causes the following
warnings:

  CHECK   drivers/power/ab8500_fg.c
ab8500_fg.c:818:13: warning: incorrect type in assignment (different base types)
ab8500_fg.c:818:13:    expected struct v_to_cap *tbl
ab8500_fg.c:818:13:    got struct abx500_v_to_cap *const v_to_cap_tbl
  CC      drivers/power/ab8500_fg.o
ab8500_fg.c: In function 'ab8500_fg_volt_to_capacity':
ab8500_fg.c:818:6: warning: assignment from incompatible pointer type [enabled by default]

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

include/linux/mfd/abx500/ab8500-bm.h

@@ -255,16 +255,6 @@ struct batres_vs_temp {
 	int resist;
 };
 
-/**
- * struct v_to_cap - Table for translating voltage to capacity
- * @voltage:		Voltage in mV
- * @capacity:		Capacity in percent
- */
-struct v_to_cap {
-	int voltage;
-	int capacity;
-};
-
 /* Forward declaration */
 struct ab8500_fg;