ARM: S3C64XX: Reduce residency requirement for cpuidle WFI mode

Entering and leaving WFI is really cheap so there's no reason to have much
of a residency requirement for the state. Lower it to 1ms.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-s3c64xx/cpuidle.c

@@ -55,7 +55,7 @@ static struct cpuidle_state s3c64xx_cpuidle_set[] = {
 	[0] = {
 		.enter			= s3c64xx_enter_idle,
 		.exit_latency		= 1,
-		.target_residency	= 100000,
+		.target_residency	= 1,
 		.flags			= CPUIDLE_FLAG_TIME_VALID,
 		.name			= "IDLE",
 		.desc			= "System active, ARM gated",