ARM: exynos_defconfig: add driver for ISL29018

Intersil 29018 light and proximity sensor is built into Exynos based
Peach-Pit/Pi Chromebooks, so enable driver for it to increase testing
coverage.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20231006110631.3204334-1-m.szyprowski@samsung.comSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

arch/arm/configs/exynos_defconfig

@@ -322,6 +322,7 @@ CONFIG_EXYNOS_ADC=y
 CONFIG_STMPE_ADC=y
 CONFIG_CM36651=y
 CONFIG_AK8975=y
+CONFIG_SENSORS_ISL29018=y
 CONFIG_PWM=y
 CONFIG_PWM_SAMSUNG=y
 CONFIG_PHY_EXYNOS5250_SATA=y