max17042 now uses regmap interface but does not enable config option. This 
patch fixes the following build errors:

drivers/power/max17042_battery.c:661:15: error: variable 
‘max17042_regmap_config’ has initializer but incomplete type
drivers/power/max17042_battery.c:662:2: error: unknown field ‘reg_bits’ 
specified in initializer
drivers/power/max17042_battery.c:662:2: warning: excess elements in struct 
initializer
drivers/power/max17042_battery.c:662:2: warning: (near initialization for 
‘max17042_regmap_config’)
drivers/power/max17042_battery.c:663:2: error: unknown field ‘val_bits’ 
specified in initializer
drivers/power/max17042_battery.c:663:2: warning: excess elements in struct 
initializer
drivers/power/max17042_battery.c:663:2: warning: (near initialization for 
‘max17042_regmap_config’)
drivers/power/max17042_battery.c:664:2: error: unknown field 
‘val_format_endian’ specified in initializer
drivers/power/max17042_battery.c:664:23: error: ‘REGMAP_ENDIAN_NATIVE’ 
undeclared here (not in a function)
drivers/power/max17042_battery.c:664:2: warning: excess elements in struct 
initializer
drivers/power/max17042_battery.c:664:2: warning: (near initialization for 
‘max17042_regmap_config’)
drivers/power/max17042_battery.c: In function ‘max17042_probe’:
drivers/power/max17042_battery.c:684:2: error: implicit declaration of function 
‘devm_regmap_init_i2c’

Signed-off-by: Austin Boyle <[email protected]>
---
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 5e2054a..85ad58c 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -196,6 +196,7 @@ config BATTERY_MAX17040
 config BATTERY_MAX17042
        tristate "Maxim MAX17042/17047/17050/8997/8966 Fuel Gauge"
        depends on I2C
+       select REGMAP_I2C
        help
          MAX17042 is fuel-gauge systems for lithium-ion (Li+) batteries
          in handheld and portable equipment. The MAX17042 is configured
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