ARM: S5PV210: Reduce the iodesc length of systimer

It's enough to use 4KiB.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-s5pv210/cpu.c b/arch/arm/mach-s5pv210/cpu.c
index b9f4d67..77f456c 100644
--- a/arch/arm/mach-s5pv210/cpu.c
+++ b/arch/arm/mach-s5pv210/cpu.c
@@ -47,7 +47,7 @@
 	{
 		.virtual	= (unsigned long)S5P_VA_SYSTIMER,
 		.pfn		= __phys_to_pfn(S5PV210_PA_SYSTIMER),
-		.length		= SZ_1M,
+		.length		= SZ_4K,
 		.type		= MT_DEVICE,
 	}, {
 		.virtual	= (unsigned long)VA_VIC2,