ARM: S5PV210: Add Watchdog support for S5PV210

This patch adds support for Watchdog timer for Samsung S5PV210.

Signed-off-by: Banajit Goswami <banajit.g@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>