ARM: EXYNOS4: Add restart hook for proper reboot

This is required to use SWRESET.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
(cherry picked from commit d2edddf2b25863ec0893635662b0832f9965b543)
2 files changed