ARM: exynos_defconfig: Enable CONFIG_SND_SOC_ODROIDX2 for Odroid-XU3

Enable CONFIG_SND_SOC_ODROIDX2 and CONFIG_SND_SIMPLE_CARD to enable
sound on Odroid-XU3 board using the max98090 audio codec.

Signed-off-by: Anand Moon <linux.amoon@gmail.com>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>