mfd: tps65911-comparator: Use regmap accessors

Use regmap accessors directly for register manipulation - removing
one layer of abstraction.

Signed-off-by: Michał Mirosław <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/tps65911-comparator.c

···
 		return -EINVAL;
 
 	val = index << 1;
-	ret = tps65910_reg_write(tps65910, tps_comp.reg, val);
+	ret = regmap_write(tps65910->regmap, tps_comp.reg, val);
 
 	return ret;
 }
···
 	unsigned int val;
 	int ret;
 
-	ret = tps65910_reg_read(tps65910, tps_comp.reg, &val);
+	ret = regmap_read(tps65910->regmap, tps_comp.reg, &val);
 	if (ret < 0)
 		return ret;