ARM: exynos_defconfig: Enable NTC Thermistors support

The Exynos5420 Peach Pit and Exynos5800 Peach Pi Chromebooks have
IIO based ADC thermistors. Enable built-in support for its driver.
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

arch/arm/configs/exynos_defconfig

@@ -94,6 +94,7 @@ CONFIG_CHARGER_MAX14577=y
 CONFIG_CHARGER_MAX77693=y
 CONFIG_CHARGER_TPS65090=y
 CONFIG_SENSORS_LM90=y
+CONFIG_SENSORS_NTC_THERMISTOR=y
 CONFIG_SENSORS_PWM_FAN=y
 CONFIG_SENSORS_INA2XX=y
 CONFIG_THERMAL=y