ARM: dts: fix T-FLASH hotplug detection for exynos4412-odroid-common

TFLASH (SDHCI2 controller) uses internal card detect line, but it looks
that the driver fails to operate it properly. Use GPIO interrupt on
SD_CDn line for detecting SD card state.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>