ARM: S5P: Add System define for arch_reset()

This patch adds system define for arch_reset() using Watchdog reset.
And adds IO mapping for using WDT.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/plat-s5p/cpu.c b/arch/arm/plat-s5p/cpu.c
index 75cb8c3..1ab55e8 100644
--- a/arch/arm/plat-s5p/cpu.c
+++ b/arch/arm/plat-s5p/cpu.c
@@ -103,6 +103,11 @@
 		.pfn		= __phys_to_pfn(S5P_PA_GPIO),
 		.length		= SZ_4K,
 		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S3C_VA_WATCHDOG,
+		.pfn		= __phys_to_pfn(S3C_PA_WDT),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
 	},
 };