ARM: exynos_defconfig: Enable CONFIG_SENSORS_INA2XX for Odroid-XU3

Odroid-XU3 board support power monitor sensor.

Below is the output of boot log.
[    3.241438] ina2xx 0-0040: power monitor ina231 (Rshunt = 10000 uOhm)
[    3.248068] ina2xx 0-0041: power monitor ina231 (Rshunt = 10000 uOhm)
[    3.254724] ina2xx 0-0044: power monitor ina231 (Rshunt = 10000 uOhm)
[    3.261354] ina2xx 0-0045: power monitor ina231 (Rshunt = 10000 uOhm)

ina231-i2c-0-40
Adapter: s3c2410-i2c
in0:          +0.00 V
in1:          +1.01 V
power1:      175.00 mW
curr1:        +0.18 A

ina231-i2c-0-41
Adapter: s3c2410-i2c
in0:          +0.00 V
in1:          +1.21 V
power1:       50.00 mW
curr1:        +0.04 A

ina231-i2c-0-44
Adapter: s3c2410-i2c
in0:          +0.00 V
in1:          +1.02 V
power1:       50.00 mW
curr1:        +0.04 A

ina231-i2c-0-45
Adapter: s3c2410-i2c
in0:          +0.00 V
in1:          +1.04 V
power1:       75.00 mW
curr1:        +0.07 A
Signed-off-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

arch/arm/configs/exynos_defconfig

@@ -95,6 +95,7 @@ CONFIG_CHARGER_MAX77693=y
 CONFIG_CHARGER_TPS65090=y
 CONFIG_SENSORS_LM90=y
 CONFIG_SENSORS_PWM_FAN=y
+CONFIG_SENSORS_INA2XX=y
 CONFIG_THERMAL=y
 CONFIG_CPU_THERMAL=y
 CONFIG_THERMAL_EMULATION=y