ARM: dts: Add sleep mode pin configuration for exynos4412-trats2

This patch adds sleep mode pin configuration using pin control hog
mechanism to configure states of GPIO pins in sleep mode. This is
required to reduce leakage current in sleep mode and prevent glitching
of components on the board.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>