intel_idle: enable IVB Xeon support

IVB Xeon currently shares the same parameters IVB client.

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index e872617..b0f6b4c 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -413,6 +413,7 @@
 	ICPU(0x2a, idle_cpu_snb),
 	ICPU(0x2d, idle_cpu_snb),
 	ICPU(0x3a, idle_cpu_ivb),
+	ICPU(0x3e, idle_cpu_ivb),
 	{}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_idle_ids);