ARM: s5pv210_defconfig: enable IIO required by MAX17040

After adding support for passing temperature data from thermal sensor
to MAX17040 it got dependency on CONFIG_IIO. From all defconfigs
using MAX17040 only s5pv210_defconfig did not have IIO already enabled
so let's enable it to avoid regression.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Link: https://lore.kernel.org/r/20230731073613.10394-5-clamor95@gmail.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>