ARM: EXYNOS: Set 64-bit DMA mask for EXYNOS5250

This is required when LPAE is enabled.

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Tested-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Set IRQs for MAX77686 RTC

Exynos5250 can use the RTC of MAX77686.
This patch sets proper wiring in the relevant dts.

Enable thes in the .config, to use it:

CONFIG_RTC_CLASS=y
CONFIG_RTC_DRV_MAX77686=y

Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>